Only option for me at my workplace is either coffee (undrinkably bitter) or expired tea (tastes like rot). Did not have enough time yesterday to make myself tea for the next day and the shop where I buy energy drinks is closed. I extremely drownsy and my head hurts.
EDIT: Coffee is undrinkable to me, quality or not. The bitterness will just overpower everything.
Find caffeine pills. No-Doz is a popular one, but the dosage is so high you should only have one in a day.
Time release 100mg pills are your friend, if you don’t take too many.
50mg pills are hard to find, but better replace a cup of coffee.
100mg pills that are not slow release or time release hit hard and crash hard, but spread them several hours apart and cut them off at noon, and it will absolutely get you through a sleepy day.