Describe common themes in Ralston's memories.

Many of Ralston's memories are of his friends during climbing trips. Other memories involve traveling and seeing music shows with friends. However, as time continues and he gets more and more dehydrated, it is the little moments in his life that he remembers; a 7-Up in his grandparent's yard, or a slurpee, or iced tea that quenches his thirst. More and more often the memories include some sort of margarita or ice cold drink.