Okay, I'm sorry if this is a serious discussion, but the thought of wearing garbage bags under exercise clothes is such a ridiculous concept to me I had to laugh out loud (which is saying a lot considering I'm sitting here in total dental agony).
I concur with the info that "sweat" loss is just water loss - which will be regained once you replenish yourself (and if you don't, you risk becoming dehydrated which can be a serious problem). As for drinking ice cold water, I can only stomach drinking 8-10 glasses of water a day if its room temperature, but it does makes sense you'd use up more calories drinking ice cold water. Be careful though - if you drink ice cold water after exercise you're likely to suffer extreme cramping.
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"My doctor told me to stop having intimate dinners for four. Unless there are three other people." Orson Welles