SO apparently if you add enough instant coffee to make it taste like a "strong" cup of coffee... its gonna contain way more caffiene than you expected. Didn't realize it until my hands wouldn't stop jittering.
It actually tastes pretty good but yeah. Don't be like me. Looks like I'm definitely staying up until midnight.
NOT MEDICAL ADVICE
it's just coffee, that's probably fine if there aren't any pre-existing conditions. Don't take a bottle or anything but a normal amount is maybe not ideal health wise but hardly dangerous to a normal person.