This might not work for you but nearly every time I've went to the store and unintentionally did this, Ive got asked this by the girl. Make sure you come in late at night, so its not alot of people, so if you do end up talkin with her, its not some angry nikka behind you. But, I would pick up a few items, along with 2 packs of condoms and go to her line....its a ice breaker.
If she thinks you're cute, especially if she's a hood booger (hood boogers will always ask this, always, and I doubt you're searchin for classy bytches at RiteAid

) she should say something along the lines of "what you need these for"?
Brush it off like

Make small talk with her. Next time, you'll be a familiar face & not some idiot customer. When she says Hi next time, and she will, its on you charm her. If she asks about last time, say "she just a friend"

nearly every broad will reply with somethin along the lines of: "hhhhhhhmmmmmmm, sure". If you have any semblance of game, it's pretty much impossible to fukk up at that point
Or you could just step to her straight up but, I dont know how you look tho b. You could be an ugly, fat motherfukka which would render this post useless.