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Bad taste or dying? Take a concrete pill at the same time :D

If you're a middle aged or older bloke, add an aspirin tablet to your kit. In the event of chest pain/heart attack, take 300mg. It might make all the difference. It's one tablet to carry and the risk...

Commercially available kits have too much stuff in them to my mind. Everything is a balance though, risk of carrying shit around that you'll never use versus not having something when you need it.