Way to conduct this marketing campaign

Hi I am new here. Sorry if it is not suitable to ask this question here. I really don’t know where to ask.

I will start my summer internship for a marketing company targeting soft drink customers. Except for the background research we’ve done a lot about the drink, we also want to do something cool campaign to engage our customer, even reach new ones.

With these ideas, our company wants to collect more in-store customer analytics We want to know more about some interesting insights like different preferences between gender, or yellow-dressed people tend to pick the specific drink, etc.

Do you have any way to collect these demographic data (not personal) ? Much thanks!