This is the inside of my water bottle; is antifreeze poisonous? I have a feeling that this will be a difficult ride for my fueling/hydration strategy. My flasks are already freezing and I have them inside my jacket. I'll carry one bottle in my jacket pocket with extra heat pads that I'm carrying to keep it liquid, and I'll buy hot water at each stop to thaw the other one. Eating and drinking are the priority on a long ride, especially a cold long ride.