I would recommend having a large presence on campus. The more times college students see the brand the more likely they are to remember it. This could include sponsoring multiple on campus events, handing out samples in high traffic areas, or even simply handing out coupons/recipe cards they can use on their next grocery run. College kids are most likely to remember companies when they give them something (ie: swag, samples, coupons) and will continue to remember the brand past the event. Additionally, if they do not receive something, but continue to see their branding (ie: at events or tabling sessions) then they will be more inclined to try it on their own time.