In the opening of the Hot Spell episode everyone at China Beach is trying to beat the heat.

McMurphy steps over a fence and stands in a lawn sprinkler. It is very clear that she is wearing shorts and combat boots, yet as she bends to get closer to the water source she is clearly barefoot.

***There is no cut to suggest passage of time and the close shows her bending down the long shot is a match on action and shows her in the process of bending so she should still have the boots on.