Thanks for the advice on rotating water. I already do that. I was just wondering if I had stashes of water in different locations, if that water could stay drinkable if I don't visit those locations for years.

As for a cup. I was already including a cup and a bowl. I've decided to take out the cup and use the bowl for both cup and bowl duty.

I am conserned about contaminating water bottles because I live in the desert south west. There have been many times when I've consumed half a bottle of water left it outside for a day and then come back to it to find it smelled really bad. So bad that I would never consider finishing off the bottle. I can only assume it smelled that way due to bacteria from my own backwash. And no I don't have an unreasonably dirty mouth.
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