I do not trust my sister to give my kids healthy snacks...what are some easy ones I can pack for them?

Ideas on good dye free, healthy snacks for toddlers and kids? My sister babysits but I don’t trust her ways of feeding my kids. She’s extremely lazy with it. Half the time I’ll tell her what to make or what they can choose from and the sides they can have with their lunches (I do breakfast) and she does whatever she can do that’s laziest. I worry about them getting what they need nutritionally. I’m looking for some good ideas that I can store for them to reach, dry and fridge snacks! I’ll be putting them in little to go condiment containers and ziplock bags.