cowboy coffee is the way forward, no exspence as you just use your normal bill or pot....
how it works.....
take your pot billy or what ever, fill it with the required amount of water for your coffee pluss a little bit more, to allow for the coffee to do its thing, heat it on your fire stove or heat source of choice, when it simmers add the coffee of choice, stir well...
heat for another few moments, then remove from the heat or to a cooler spot by the fire...
let it stand for 30 seconds, stir well again then leave for 2-4 mins, by this time the coffee should have sunk to the bottom...
its done, slowly tip of your coffee into your mug, or if your like me and use your mug to brew in, drink away....
thats the cowboy way... it works for me....