Earlier quoted context omitted.
Get yourself a moka pot, aeropress or French press. Fantastic coffee for very cheap. Highly unlikely that 2-3 times a week will last though - either religiously stick to once a week or be open to drinking it daily.
I have a moka pot but I guess I am doing it wrong -- maybe I should not fill its coffee compartment to the brim? is there other way of doing it? -- because the coffee that gets out destroys me: heart palpitations, slight arrhythmia, headaches, and energy crash. I can't drink too much caffeine but light doses (i.e. the Americano) actually help me and energize me. It's really weird. What's good about the aero-press and…
How big is your moka pot? A "4 cup" Bialetti takes around 16-18g of coffee, which isn't a lot.
No matter how dilute your end product is, the amount of caffeine consumed will roughly be about the same. But I guess diluting it means you take longer to consume all that caffeine.