Question About Hydration Packs

So I'm going to my first overnight/camping rave event at the end of the month, and everyone is telling me to get a hydration pack- like a camelbak type thing. The problem is that I've tried the water from those before, and it always tastes kind of *foul.* Rubbery and plasticky. I can't stand it.

Does anyone have a recommendation for a bag that won't taste nasty, OR for a good way to mitigate the nasty flavor? I know there are those little flavored hydration pouches I could add, but I've never found one I liked the taste of. I know I'm picky, and I'm sorry!