Another option for water is to hit the surplus store and pick up a military water jug. I have one of these and they are indestructible. They are made of thick plastic and have a pour spout as well as a fill lid. Now they may be a bit big for a truck, but for a pick up truck or SUV, they can strapped down.

They come in two colors, tan and black. I would recommend the tan ones. The black ones take in heat and store it up which makes it tough to drink from in the summer, but they make warm water for washing up when you are camping or for washing off feet after a day at the beach!

Garrett
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On occasion of every accident that befalls you, remember to turn to yourself and inquire what power you have for turning it to use. - Epictetus