The simplest thing is caffeine pills. They're cheap and freely available over-the-counter.

Making yourself some coffee is not hard at all. Drip coffeemakers are ubiquitous and cheap, if you think the coffee is too weak just put more grounds into the basket. Otherwise try Aeropress, it's good. I also like Turkish coffee but most people think it's too muddy. If you want a hobby, buy a proper espresso machine :-)

Tea is even simpler, all you need is tea and boiling water. Experiment with different teas (they are VERY different), figure out what you like. I strongly recommend loose tea over teabags.