Over the years of hunting and fishing trips I have tried just about every solution there is for making coffee.
I have a Lexan Press myself, but find I don't care for it much as the amount of coffee is fairly limited, with cleaning needed between runs.
I have, and still do, use the singles when they are the most convenient. They get expensive when making larger amounts of coffee, but are great for a quick cup or two.
We have one of the cup-top filter holders, and it works quite well. No complaints there, as long as one realizes it is made to make a limited amount per run.
For larger quantities of "good" coffee, nothing IMO beats a percolator. I have a baked enamel version I picked up at Walmart several years ago for cheap, and it works great. I've used it at every elevation from sea level to 10,000' plus. It does take a while, and a wile longer at higher elevations. But it consistently makes good coffee, and the cleanup is not bad considering the amount it will make per run (20cups).
I have used several improvised methods over the years too. Boiling water, a paper towel, and some grounds will make a palatable cup of joe too. Just set it up like an auto drip using the paper towel as a filter and pour the water thru it. But it needs to be a good quality towel, preferably non printed. But anything will work in a pinch, even a clean, or if you're that big a joe junkie, any sock full of grounds soaked in some hot water.