Your food choices around the Mono Lake [1] area might feel limited if you’re coming right from Los Angeles [2] or San Francisco [3]. Nor will you see many of the standard fast-food chains.
However, the town of Lee Vining offers a number of respectable eateries, plus adequate groceries for campers and picnickers.
Links:
[1] http://www.moon.com/destinations/california/yosemite-and-the-eastern-sierra/mono-lake
[2] http://www.moon.com/destinations/california/los-angeles-and-orange-county
[3] http://www.moon.com/destinations/california/san-francisco-and-the-bay-area