Build a water cooler/dispenser similar to an arrowhead dispenser for my truck?

i have some time and money over the summer and was thinking this would be a convenience to have drinking water when taking longer drives, as well as when out. my idea is to build a water storage/cooling system to fit in my truck bed. my idea is to build something similar in size to the tool storage chest you run across the bed close to the cab and similar in design to the water coolers you attach 5 gallon water jugs to. then either set up a dispenser on the unit to fill glasses/bottles or run some tubing with insulation to the cab of the truck and build a dispenser there (remove the ash tray). the issue i'm running into is how to cool the water and to power my system without destroying my truck battery. the cooling system i'm thinking i could steal from an older refrigerator or maybe alter some sort of air conditioner. for power, maybe an extra battery or two that only ran the water cooler, but were wired to the alternator. or if i could find some relatively inexpensive solar panels I could use those. any build or power suggestions would be greatly appreciated. alternatives are okay too. thank you for your time!