I brewed at home and carried a corny keg to the boat. 5 gallons of beer is essential to survival if becalmed and it makes good ballast too.
These CO2 chargers are a little bit of a pain, but they work. A 5lb CO2 bottle with a regulator would be better.
An important accessory to beer on tap:
Here is a simple how-to for brewing beer:
Beer Brewing