The forts where crushed and they made their travel way through boat. they also gather water for drinking and maybe for rinsing off built forts for shelter and they went hunting to gather food so they don't stave.
They where good on food and many other supplies up until john left they had a food shortage and very little rainfall. once he left many shortages have appeared and that's how we know that the town needed him.
food for my scenario i think that they wont be able to survive because they have a very bad food supplies and very little rainfall. Therefore they couldn't be able to live with out much food or water they may have shelter but they don't have the actual materials that they need.