Set the Jinnee in the Bottle Free

Has it ever happened to you to be in the situation, dying of thirst and having the bottle of drink by your side, but not having an opener for it? Well, it happened to me. Those of you who shared my ‘destiny‘ know what I’m talking about… Others, God help you never to be in the situation. Accidentally, it happened to me recently, so I tried searching which opener is the most suitable for carrying, and those are what I liked most. Which one do you suggest me to always have by my side?