Reddit reviews AOZITA 6 Pack Sprouting Lids for Wide Mouth Mason Jars - Food Grade Plastic Sprouting Jar Strainer Lid for Canning Jars - Sprouting Screen for Various Seeds, Beans - Come with 1 Instruction Book

Grow your own? Then you only need to grow what you'll use. I throw a tablespoon of alfalfa seeds in a mason jar on Thursday evening or Friday morning. Cover them with water and drain that 12 hours later. Rinse once in the morning, once in the evening for the next few days and by Monday morning I'm throwing fresh alfalfa sprouts in my salad. Once they're a few days old I put the mason jar in the fridge and stop rinsing, they'll stay fresh for a few more days. I use these lids but you could rig up something with some plastic mesh and the mason lid rim or a rubber band. If you do that, find a way to prop the jar up so it drains. Super easy. I've had one batch go slimy and that was mostly because I forgot to rinse them once or twice.

I’m thinking rockwool will be the best medium with the least amount of nutrients. But know that I’m just guessing.

Depending on the size/scope of your experiment.... could maybe grow them all the older fashioned way.... in large mouth mason jars with just rinsing them with water, mhp or the kit nutrients. I’d have to think on that.