[Kidkraz]

Not to be disrespectful here, but Yosemite allows soft sided camper and tents.
If the camper is hard-sided, you can have food inside the camper. If it's a soft sided or tent then you'll have to use the bear lockers for food and any other tasty or smelly items. I've been told in the past, in other bear country, refrain from using perfumes or smelly deodorants, since that can attract bears.
The best thing is do yer research before you make reservations or reach out to the camp ground for info prior to making reservations.