Been using Camelback(the brand name) and other hydration bladders for years. The best thing since sliced bread in my book. I also find that the on-off valves are worth the extra money.
Make sure the bladder and tube are really clean, and after clean, are dried out between uses so you get no mold or mildew. I invested in a couple of the devices that go in the bladder and keep it open so it can dry out between uses. I also take the tube off and clean and drain it, letting it dry separately.
I've have kept water in a clean bladder for months and had no ill effects. (I think the issue of mildew arises when one has water and air in the bladder.)
Also, I only ever fill it with water. Either room temperature, or with ice.
You can also get water filters for your camelback if you don't like the taste.
In my experience, the rubbery taste will hopefully go away when the bladder and tube are not as new.
I love 'em, but admittedly, they are not for everyone.
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