a friend wanted a drink of water and grabbed a bottle took a swig and it was vinegar. it only made her gag but it could have been something much worse, I have a young friend with adhd and she will drink anything in a bottle it could be caustic soda and she wouldn't stop till it was all gone. her parents are so careful not to leave anything about, she grabed a half empty can of cool drink someone had left and drank it down it was a couple of days old and could have had a bee in it, fortunatly she was lucky that time but she just had a sugar high for 3 days, when we had people looking after mum they couldn't use anything if it wasn't in the proper bottle. you just can't be too careful