Just Purchased a Aerogarden Veggie pro 6

Wondering if i have to buy the little packets made for it or can i walk into my local walmart and buy something different if so what?
Also should i buy a air stone for it ?

this is my first go for aeroponics!!!! tips would be nice.

u dont need to use the packets it comes with. go to a hydropinic store and theyll help u out or look at nutrients forum... right now mine are 3 weeks and im just using a smalllllll bit of a miracle gro indoor plant liquied nutrient. just for the nitrogen..