We are paid monthly and try and keep under $900 for groceries. I have 2 in nappies and 1 in nappy pants overnight so that takes a fair hunk of the cash. At the beginning of the month I do a big meat order (home delivered) which is usually around $200. I meal plan around that. I do a big shop for all non perishables- rice, pasta, noodles, toiletries, cleaning products, cereal, tinned food, baking supplies, and fruit and veg, bread and milk. I top up fruit and veg, milk and bread throughout the month.
I bake muffins/ Anzac slice/ banana bread/ cookies a couple of times a week so don't generally buy prepackaged snacks.
I find meal planning is the key to keeping under budget.