Preheat oven to 375In a medium saucepan bring the water to a boil and add butter stirring to melt it. Add flour and salt immediately and stir until it form a ball. Add in one egg at a time beating it completely in before adding the next egg. Let sit for 5-10minutes. Pipe dough or spoon about 1T, 2 in apart on a parchment paper lined cookie sheet and bake for 20-30 minutes. Once they have cooled completely fill puffs with filling of choice.