A single beer, normal alcohol content, isn't going to do too much to an adult. I definitely would NOT pitch it - if I thought there was a serious risk of dehydration. I also wouldn't drink it if I knew I was in a siutation requiring critical judgment. Drink it when you're relaxed. It's still liquids. So the bottom line ... is that it depends upon your specific situation. But it's a "resource" just like anything else.

Pete2