Small joints serving local Indian food are available. Instant noodles are available in all these joints.
Due to the holiness attached to the place, non vegetarian food, including eggs are not available.
Alcohol consumption is prohibited in Gangotri. Aerated water soft drinks are available. But it is advisable that one sticks to natural water, tea and coffee.
When traveling to Gaumukh from Gangotri, drink tea and carry glucose biscuits available in shop. No need to carry water, you will find water streams thats pure water on the way.