diff --git a/src/main/java/gg/uhc/uhc/modules/potions/BrewingRestricter.java b/src/main/java/gg/uhc/uhc/modules/potions/BrewingRestricter.java
new file mode 100644
index 0000000..7692c27
--- /dev/null
+++ b/src/main/java/gg/uhc/uhc/modules/potions/BrewingRestricter.java
@@ -0,0 +1,174 @@
+/*
+ * Project: UHC
+ * Class: gg.uhc.uhc.modules.potions.BrewingRestricter
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 Graham Howden <graham_howden1 at yahoo.co.uk>.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package gg.uhc.uhc.modules.potions;
+
+import com.google.common.base.Function;
+import com.google.common.base.Predicate;
+import com.google.common.base.Predicates;
+import com.google.common.collect.*;
+import org.bukkit.Material;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.inventory.*;
+import org.bukkit.inventory.BrewerInventory;
+import org.bukkit.inventory.ItemStack;
+
+import java.util.Collection;
+import java.util.Set;
+
+public class BrewingRestricter implements Listener {
+
+    public static final Set<Integer> INGREDIENT_SLOTS = ImmutableSet.of(3);
+    public static final Set<Integer> OUTPUT_SLOTS = ImmutableSet.of(0, 1, 2);
+
+    protected static final Predicate<ItemStack> IS_NULL_OR_EMPTY = new Predicate<ItemStack>() {
+        @Override
+        public boolean apply(ItemStack itemStack) {
+            return itemStack == null || itemStack.getType() == Material.AIR;
+        }
+    };
+
+    public boolean isIngredientItemAllowed(ItemStack ingredient, Collection<ItemStack> potions) {
+        if (potions.size() == 0) return true;
+
+        // TODO
+        return false;
+    }
+
+    public boolean isOutputItemAllowed(ItemStack output, ItemStack ingredient) {
+        if (IS_NULL_OR_EMPTY.apply(ingredient)) return true;
+
+        // TODO
+        return false;
+    }
+
+    protected Collection<ItemStack> getOutputSlots(final BrewerInventory inventory) {
+        // TODO check slot ids
+        return Collections2.filter(
+            Collections2.transform(
+                OUTPUT_SLOTS,
+                new Function<Integer, ItemStack>() {
+                    @Override
+                    public ItemStack apply(Integer slotId) {
+                        return inventory.getItem(slotId);
+                    }
+                }
+            ),
+            Predicates.not(IS_NULL_OR_EMPTY)
+        );
+    }
+
+    @EventHandler(ignoreCancelled = true)
+    public void on(BrewEvent event) {
+        // TODO we need to run state checks here too to 'pop' out disallowed output items/input items
+    }
+
+    // cancel hoppers moving disallowed items into the stand
+    @EventHandler(ignoreCancelled = true)
+    public void on(InventoryMoveItemEvent event) {
+        if (event.getDestination().getType() != InventoryType.BREWING) return;
+
+        // TODO check hopper side so we can determine the difference between fuel and ingredient blaze powder
+        boolean isIngredient = true;
+        boolean isOutput = true;
+
+        final BrewerInventory inv = (BrewerInventory) event.getDestination();
+
+        if (isIngredient && !isIngredientItemAllowed(event.getItem(), getOutputSlots(inv))) {
+            event.setCancelled(true);
+            return;
+        }
+
+        if (isOutput && !isOutputItemAllowed(event.getItem(), inv.getIngredient())) {
+            event.setCancelled(true);
+            return;
+        }
+    }
+
+    // stop dragging over slots
+    @EventHandler(ignoreCancelled = true)
+    public void on(InventoryDragEvent event) {
+        if (event.getInventory().getType() != InventoryType.BREWING) return;
+
+        final BrewerInventory inv = (BrewerInventory) event.getInventory();
+        final ItemStack cursorStack = event.getOldCursor();
+        final Set<Integer> affectedSlots = Sets.newHashSet(event.getRawSlots());
+
+        if (Sets.intersection(INGREDIENT_SLOTS, affectedSlots).size() > 0
+                && !isIngredientItemAllowed(cursorStack, getOutputSlots(inv))) {
+            event.setCancelled(true);
+            return;
+        }
+
+        if (Sets.intersection(OUTPUT_SLOTS, affectedSlots).size() > 0
+                && !isOutputItemAllowed(cursorStack, inv.getIngredient())) {
+            event.setCancelled(true);
+            return;
+        }
+    }
+
+    // cancel click events going into the stand
+    @EventHandler(ignoreCancelled = true)
+    public void on(InventoryClickEvent event) {
+        if (event.getInventory().getType() != InventoryType.BREWING) return;
+
+        // clicked outside of the window
+        if (event.getClickedInventory() == null) return;
+
+        final InventoryType clicked = event.getClickedInventory().getType();
+
+        // get any relevant stack to check the type of based on the action took
+        ItemStack relevant = null;
+        switch (event.getAction()) {
+            case MOVE_TO_OTHER_INVENTORY:
+                // only worry about player -> stand
+                if (clicked == InventoryType.PLAYER) {
+                    relevant = event.getCurrentItem();
+                }
+                break;
+            case PLACE_ALL:
+            case PLACE_SOME:
+            case PLACE_ONE:
+            case SWAP_WITH_CURSOR:
+                // only worry about within a stand
+                if (clicked == InventoryType.BREWING) {
+                    relevant = event.getCursor();
+                }
+                break;
+            case HOTBAR_SWAP:
+                // only worry about within a stand
+                if (clicked == InventoryType.BREWING) {
+                    relevant = event.getWhoClicked().getInventory().getItem(event.getHotbarButton());
+                }
+                break;
+            default:
+        }
+
+        // TODO check item
+    }
+}