A mixed hardwood/coniferous forest will have complex soil types ranging from decomposing ganite to the fine silts your very water source is in. You can make a serviceable clay container and fire it to useable temper in the time alloted with plenty of time to heat rocks as a heat source to drop inside. If you kill or come across a large dead animal, the stomach makes a water container that will hold water over a fire and achieve boiling temps.