My first pocket cruiser
had a 30-gallon tank, I chose to carry water
containers both to carry a larger volume of water and because I questioned the water quality from the very old inaccessible main tank.
I built a new shelf unit near the galley
with a fiddle that held a 5-gallon coleman water container with spigot. I kept five additional containers under a dinette seat which was fairly central and low in the boat. What I liked about this system was: 1. always knowing exactly how much drinking water
I had left, 2. Having the drinking water
compartmentalized, so that it was very unlikely I'd ruin, contaminate or spill all of it at once, 3. Being able to take the jugs to any water source in the dingy to fill up. (Sometimes I even used them first to fill the main water thank then filled them again with drinking water).
What I didn't like was that it either took up storage
area below, or could cause a potential weight distribution , safety
or loss issue if stored on deck
. Hefting 5 gallon water containers around is also hard on the back as one gets older....