Thanks for the feedback! Yeah, I know the current control scheme is kind of a mess. I ran out of time to iron out the kinks/add all the features i wanted, and I want to release an update where you can spread water in all 4 directions.
If a firefighter has water, they should switch to a sprite where the buckets have a little blue at the top of them to signal that they're full, but given how tiny the sprites are that's definitely easy to miss