Swiss Franc or Euro and spendings in Switzerland?

From my experience Coop and Migros offer more ready to eat options than Lidl. Do try some cheeses but check if you buy Swiss cheese as they also have some from other countries. Be sure to buy some packages of Rösti (there's Hero and other brands): sliced potatoes either natural or with meat, unions, mushrooms, etc. It needs to be cooked rather long in a frying pan.

Thanks Arno for all the advice - Vishal