I did a really long ride up in the high desert - Flagstaff - Sunset Crater - Grand Falls. Well I was supposed to get out to Grand Falls, but the 1 litre bottle I had in the trunk bag had developed a leak, so I was screwed when I went to replenish the water bottles. It was a fairly grueling ride back down towards town. That was the thirstiest I ever was. Of course you can go a couple of days, but riding a bike is really rough when thirsty. Luckily a Navajo who boasted "city water" refilled my water bottles and fed me some hominy casserole.