We use a Keurig on the boat. If I were to get another one, it would be the kind you pour the water in the top from the cup you are using, so you get the size you want. Keurig cup sizes are ridiculously small. Plus, you don’t have to keep filling up a reservoir. I agree with Capta about the environmental issue, which is why I hate single serve water bottles, too.
Nonetheless, we did find a great source for the pods. We pay WAY to much for them in the stores down here, but we found that Intelligent Blends online has great prices ($0.34 each), and free shipping here.