The only river that I have ever panicked about swallowing was the Charles River right next to my house, which, up until a few years ago, was polluted. And guess what? Before it was de-polluted, I fell in! And nothing happened to me. Also, There are signs if it is too polluted to swallow, like there were signs on the river for a while. You will be fine! Same with the water bottle thing...kayaking is such an athletic sport that if someone felt sick, that someone probably wouldn't go.
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<3 Anya--
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