Bucket Replenisher

Auto Bucket Swap
Never dig through your inventory for the next water bucket mid-build again.

You place water, end up with an empty bucket, open your inventory, drag down the next full bucket, close the inventory — and repeat that for every single block. This mod does it for you.

The moment you place a fluid, it scans your whole inventory for the next full bucket of the same fluid and swaps it into your hand. The empty bucket goes into the slot the full one came from. You are instantly holding a full bucket again and just keep building.

What it’s good for

Building on DonutSMP — water pools, farms, large terraforming projects: anywhere you empty buckets by the dozen, you save an inventory detour on every single placement
Lava work — lava trenches, mob grinders, decorative lava
Redstone & farms — place water streams precisely without breaking your building flow
Terraforming — fill lakes and rivers without losing your rhythm
What it does

Pulls full buckets from your entire inventory, hotbar and off-hand included
Never gets in the way: no matching bucket → behaves exactly like vanilla
Water and lava kept separate — a water bucket never accidentally pulls lava
Vanilla-style settings menu, freely rebindable key (default: K)
Client-side only, 11 KB, works on vanilla servers
Installation: Fabric API + autobucketswap-1.0.0.jar into mods, restart. Minecraft 1.21.11, Java 21.