Translation:Mishnah/Seder Moed/Tractate Shabbat/Chapter 22/4

Mishnah 4
 One may put cooked victuals into a cave (or cellar) for the purpose of preserving them; also put clean water (contained in a vessel) into water that is not drinkable, in order to keep it (the former) cool; likewise cold water (in a vessel) into hot water, in order to warm the former. One whose clothes have dropped into the water while on the road, may unhesitatingly go on with them. As soon as he arrives at the outmost court (of the city or village), he may spread his clothes in the sun to dry, but he must not do this publicly. 