Playing house

I'll be watching my cousins, ages 7 and 10, for a couple hours tomorrow. I wanted to make sure they got an afterschool snack, so I went food shopping today to pick up a few items... the only problem is that I have no idea what kids eat these days. Here's how my basic train of thought went:

I should probably get them something nutritious.
But I don't want to seem like a lame cousin.
They'll probably be thirsty, but do kids even like stuff like Capri Sun anymore?
Propel fitness water... okay! I'll get a six-pack of those. They're not soda and I know they drink that at home.
Now for something to eat...
Hmm, what do I see commercials for on TV?
Totino's Pizza Rolls! Nice, I know Jeff* eats those too so we're golden.
Maybe something sweet? Hmm, I like these mini scones and wouldn't mind finishing off the tub after they're gone.

* Jeff turns 22 this May.