Jon, never drink cold water or ice when hot and dehydrated! Just a few years ago a lady cyclist lost her water bottle on the slick rock trail in Moab UT, she was totally dehydrated and couldn't bike, or walk to the trail head. After a few hours in the 100+ degree heat some guys in a jeep found her on the trail, they offered her water but she refused, and just wanted her water bottle back. Long story short, the jeep guys told her that she needed to drink water, she gave in and drank some ice cold water that the guys had in there jeep. within minutes she went into shock and almost died! If she would have drank her warm water, she would have been just fine, so be careful