What are you planning to put in it, warm tea? Aside from the fact that sucking hot liquids from a straw device isn't to wise a move, I'd guess that no one recommends their bladders be filled with hot liquids. One's perception of 'hot' is quite different from my experience.
Your probably better off carrying a stainless steal thermos along with some room temperature water in the hydration pack.
I would guess if it's not too hot to drink & burn your mouth, I don't see why you couldn't put it in the camelback bladder? I mean, I've put mine in the sink with hot soapy water to clean it, water hot enough that I wouldn't drink it you know...it's been fine, doesn't melt or anything.
when you put a hot liquid or a liquid other than water it ruins the camel back. you get a real plastiky (not a word) taste when you put water in again. it takes many cleaning to fix it and sometimes it doesn't work at all
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