Question

how did Gulliver convey to Lilliputians that he was hungry and how was he fed by them ?

Answer 1

THEY FED THEM BY GIVING HIM LOT OF FOOD

Answer 2

He noted that he needed to eat, and they tried to feed him from their stores. Basically in one meal he ate more than would feed hundreds of Lilliputians because their food was so small compared to his monstrous size. He also drank as much wine as they could bring him and drained their cellars.