I had food poisoning on a hiking trip once.

After a quick dinner in Banff*, my wife and I hit the trail for a long-weekend backpacking trip, and set up the first night's camp about 6 km in.

My wife spent most of that night in the outhouse, but felt ok the next morning, so we continued. A few km's later, it hit me, and the rest of the day was hike a bit, duck into the bushes, repeat until done. At least there *were* bushes, and no shortage of water for rehydration. That trip wasn't busted, but a bit more serious problems for either of us and it might have been.

Since then I have made sure never to underpack when it comes to TP!

*the restaurant was Melissa's; it's still there.