How about this?
A bucket which can be directed at sea/lava/oil/acid tiles. When 'fired' in the direction of such a tile, that tile will become replaced with a patch of earth until map reset.
Bucket will then be replaced in your inventory with one that appears filled with the respective fluid.
Player can then direct their filled bucket in a direction of choice and when activated, will drop a tile of that fluid in that direction.
Each type of filled bucket could then go on to be a crafting recipe ingredient as well as having this ability.
Hello.
Could be interesting depending on how it's actually used in the game :)
We probably don't want to allow all tiles to be such depleted, many maps depend on lava or whatever to protect stuff, I think.
Note that this can probably be almost implemented using the harvesting system:
What probably would lack is a way to remove one "tool" when used (so you lose the bucket but gain a filled bucket).
The original idea what that this would simply be a different way to gain a resource you could then use in a crafting recipe. This is in development so when it's done I'll submit it :)