They virtually did nothing, although 100,000 died.
Via NY Post:
Patti Mulhearn Lydon, 68, doesn’t have rose-colored memories of attending Woodstock in August 1969. The rock festival, which took place over four days in Bethel, NY, mostly reminds her of being covered in mud and daydreaming about a hot shower.
She was a 17-year-old high-school student from Bethlehem, Pennsylvania, when she made the trek to Max Yasgur’s farm with her boyfriend Rod. For three nights, she shared an outdoor bedroom with 300,000 other rock fans from around the country, most of whom were probably not washing their hands for the length of “Happy Birthday” — or at all.
“There was no food or water, but one of our guys cut an apple into twenty-seven slices and we all shared it,” she said. At some point, a garden hose from one of the farm’s neighbors was passed around and strangers used it as a communal source for bathing and drinking, she said.