Can't beat the cheap projects. I bought a stainless sink/faucet from Lowes for $90. That part wasn't expensive, but then the drain was WAY too wide for the Mac drain hose, so creating an adapter became a challenge.
As for water container, the factory plastic camping bag was a joke. It sweated /leaked all the time. Plus, it bounced around under the sink taking up valuable storage space. So the next best mod I did was steal Duane Dunn's idea of two, 5gal plastic jugs.
They go under the V berth and I put a smaller diameter tube into the filler valve that dips down to the bottom of the jugs. Then a flexible rubber tube goes from my inlet to the pressure water pump to the V berth lockers where it connects to the hoses sticking out of the jugs (one at a time). I can switch between the two jugs and it worked very well last year. When one is empty, I know we are 1/2 remaining. They are easy to take out and refill. I didn't even use an air vent for the jugs as there is enough space for air to get back in when water is pumped out.
The best part of moving the water containers forward is we now have all that room under the sink for storage, plus our Mac is bow light, so it adds some extra weight up there. I considered a bladder tank under the aft berth, but that would do the opposite and make us more aft heavy.
--Russ