It has been stated before that Baba required very little food for Himself and what little He wanted, was obtained by begging from a few houses. But when He took it into His mind to distribute food to all.
There were two kinds of Handi, one small and the other big. The former provided food for 50 persons, the later for 100 persons. Shri Sai Charitra – Chapter 38
Every Thursday we take the example of Cooking in a big Handi for Sai devotees for about 300 devotees.
Those who want to do Thursday Bhog Sewa may refer to Pooja services Thursday Offerings. The amount can be divided between your family and friends who may want to join you to feed devotees.