look, cold water is better because your body burns calories trying to warm it up which also improves your metabolism over all, provided that you drink mostly only water, and not water during work outs and then coke and pepsi and smoothies all day, that's more counterproductive than eating big macs after workouts (Well that's a bit exaggerated). and cold water cools your body and gets absorbed by your body faster than room temperature water. however, you shouldn't freak you or worry that you're drinking water that's not ice cold if that's all that's around while, let's say, you're working out and feeling thirsty.
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