OK - I'm not afraid to admit it - I'm addicted to coffee. Traveling without coffee is not an option for me nor is drinking whatever gets provisioned to the charter boat for brewing in an old-style perk coffee maker.
So, I'm always looking for the best way to ensure that I have my favorite coffee to drink each morning while traveling without having to pack a ton of gear.
This is an interesting option: it takes a standard Nalgene water-bottle and and turns it into a nifty French-press style coffee maker. This would work perfectly on a charter boat where you can boil some water, pour it over the coffee grounds, press, and - voila - fantastic coffee to start your day in paradise.

Then, you can wash the indestructible bottle and fill it with your beverage of choice to keep on deck or carry ashore for your daily activities!
Check out the "Press Bot". For only $20, this is a cool solution.
And, you can buy Nalgene bottles here.