Come on you guys! End of day before you cool down, quickly jump into the lake or creek, even if it has ice. You will feel so good! Once you get used to cold dips, you will really like them. If air temps are cold or if it is windy, having water slowly trickle over me sounds like torture. I solar warm water by putting my platypus on top of my black gaiter, but this is to pre-warm cooking water to save fuel, not for baths.