So you are trying to reduce fluid intake then, I take it? I would recommend making cold brew and concentrating it. This can be achieved super easily with a higher grounds to water ratio and letting it "brew" for a longer timeframe - two days will give you a very nicely concentrated and caffeinated brew which you can then mix with milk and sugar syrup (after filtering out the coffee)..... I salt my syrup to help the fluid balance. Also, I just bought the "Death by Coffee" brand, which is twice the caffeine and very strong. I can easily drink like 5 coffees a day and really love coffee, but if you just make a big batch, it would last you a good amount of time.
In my experience, beginning to drink good coffee will bring appreciation for good coffee. I now love it not only for the health benefits and energy, but also for the flavor, which makes it more pleasurable. Plus, I would have to say that cold brew is the cheapest method available. All you need is coffee grounds and a glass jar (the bigger the jar, the more coffee you can make at one time). Plus, you can always heat it up if you want. I have an espresso machine too, but I think I almost prefer the flavor of cold brew over my espresso machine - especially now that it's summer. I plan to experiment a lot with coffee brewing :)
If you don't want to cold brew, you can get a stove-top espresso maker real cheap. I used one of those for years with store bought coffee (but homemade cold brew is better, IMO).