We have a couple go to coffee spots.
Circle K Columbia blend straight (iced this time of year).
Iced tea unsweetened.
Starbucks iced coffee heavy cream no sweetener when I have gift cards.
Dutch bros (the annihilator is awesome).
I drink coffee of various types from various suppliers. I'll drink Mountain Dew if that's all that's available. I avoid the energy drinks (like Rockstar, Monster, etc) like the plague.
A dirty coconut chai from my work'
From Starbucks: Iced carmelito or carmel macchiato for the starbucks peeps - this is only if I don't go to my work, or we're closed
That's what's great about them is that you can be careful. You know exactly what you're getting, so it's easy to "titrate" your mental status.
You can also keep a close eye on your tolerance. For instance, I know that if I don't use caffeine for a week, I will get a really strong kick that will last ~6 hours from just 100mg (about the same as 8oz of coffee). On the other hand, if I'm using caffeine every day, the diminishing returns become obvious very quickly (need 200mg to feel the same way 100mg made you feel yesterday, etc). One might not notice changes like this if their MO is just "I'm tired, time to drink a coffee".