Put on 4 pair of boxer underware and just let it all go for the entire time. Hope ya going for a week. By the end you will have an awsome load. Make sure you are sitting down for a few poops, lean back and let it submerge your balls. Dude you are going to be ******* all day long. Good times!!!
Take plenty of spare underwear in case you need it,and enjoy a nice soft poop any time you can.You can wash in a river or in the shower block if you are careful about timing.