We buy a lot of things in bulk and store them for later, so even perishable staples like cheese and meats we don't buy weekly since we put so much in the freezer. The only thing that we absolutely buy weekly is two gallons of milk and fresh fruit and vegetables.

But our standard grocery list of staples includes:
bread
tortillas
soynut butter
breakfast cereals
cottage cheese
yogurt
various cheeses
almonds
crackers
pretzles
goldfish crackers
Oreo cookies
lunchmeat
eggs
frozen vegetables
chicken breasts
ground beef
tilapia (the only fish the whole family can agree on)
chicken nuggets
fish sticks
french fries
canned or dried beans
rice
pastas
potatoes