Recommended Plant Food

I bought a few packs of official aerogarden jalapeño and mini tomato seeds off Amazon a few months ago with a couple of Bounty Basics and everything has worked amazing. I love how it keeps track of everything so you know exactly when to feed and water. Well, problem is I'm running low on the bottled plant food and wanted to see what everyone else uses? Do you go with the aerogarden small bottles, or is there a cheaper bulk alternative? Thanks!