If you still need more water you can always mount a double seat post triathlon setup. I mostly like double bottles because I can fill them with different stuff. I usually fill one with water and one with half water and half apple jucie in case I need a little sugar. As for a "utility bike" I've taken to mostly riding a BH cross bike (in my old age ;-). The cross bike is a lot more comfortable and just a little over 1 mph slower. The fat tires are fair in the snow and you can do easier MTB trails.

On your name "MooneyBloke" is that a reference to Peter Mooney? I had a Mooney way back in 75-76. It was number 007.