caffeine/expresso alternatives?

howdy. i drink a lot of expresso, which is a way more condensed caffeine shot for those who don't know and very powerful for most - i will drink 2-3 expresso shots in a single small mocha frappe from mcdonald's daily, as a point of reference.

i genuinely need something as intense as expresso as an alternative. ideally one that doesn't have such terrible long term health issues, mostly with the heart. i dont mind a crash as long as it could get me through 10-13 hours more or less.

im willing to make drinks at home, i don't mind having to spend a bit extra for imported or higher quality goods. in terms of dosage i'd rather be able to do it myself and mix it with a drink. so pre-packaged drinks are immediately off the list.