I found a French Press in a Ross Store, overstock, one of a kind sort of place.  It cost me a whole $2.50.   Great thing, but I don't like carrying glass in the boat unless it is sturdy stuff.  I really like the idea of just packaging coffee in regular filters with a rubber band on them, and dropping them in the water.  
This last trip i carried the little TasterS Choice single serve tubes.  That's good stuff, the best instant on the market.  
When we were out in February i made coffee a couple of times by just putting the coffee in the water and then settleing the grounds.  That works, and makes REAL coffee, but is a bit of a mess.  
Coffee is a necessity.  
piper