Caffeine tabs for $5. This is the ingredient that makes one feel good.

http://www.amazon.com/ProLab-Caffeine-Maximum-Potency-100-Count/dp/B0011865IQ

that is probably true if you have easy access to a walmart outside of a major metro area. but for amazon its a pretty good price - this appears to be the best selling caffeine pill (http://www.amazon.com/dp/B0011865IQ) and its $7.70 for 100

Already posted link yet its probs lost in the comments:

Prolab

Gurana has less of a crash you just need to take around 4 pills to get the same effects:

gurana

Tastes like shit yet has an interesting high:

guayusa

prolab

https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/expert-answers/caffeinated-drinks/faq-20057965

Its not a net dehydrator when consumed in fluid, pills aren't providing any fluid.

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https://www.amazon.com/dp/B0011865IQ?aaxitk=wwZvxo8ZdfuCbt4KvtDA1A&pd_rd_i=B0011865IQ&pf_rd_p=9420597b-7dad-4cbd-a28d-7d676ac67378&hsa_cr_id=5715315530001&sb-ci-n=asinImage&sb-ci-v=https%3A%2F%2Fimages-na.ssl-images-amazon.com%2Fimages%2FI%2F71zBwCRojWL.jpg&sb-ci-a=B0011865IQ&th=1

Caffeine pills I have used before, 75mg Calcium each