If you're as tight on cash as you say, I'm going to recommend not spending more than a dollar on a water dish until you get the wound business sorted out. That has the potential to be a long ordeal and you might be looking at multiple vet visits if it gets infected at any point before healing up.

Don't worry about him needing somewhere to soak. BPs almost never soak on their own. Plus, soaking can be bad news if you're dealing with bandaged or medicated wounds. Washes meds right off and turns bandages into bacteria traps (that's why doctors tell you not to get things wet right after stitching them up or bandaging them).