It's the deal of the day so sale ends EOD, just FYI

https://smile.amazon.com/dp/B004M5NGJG/ref=cm_sw_r_apan_glt_fabc_dl_07N1VRHRD2J8DHP7KK4V

I went dry powder nutrient. Way cheaper! This is what I use

https://www.amazon.com/MASTERBLEND-4-18-38-Complete-Combo-Fertilizer/dp/B072F2BL9D/

1L of aerogarden liquid nutrient can do 100 feedings for $25 bucks, but for the price u can get 2.5lbs of powder nutes that can feed 300-400 times. Even cheaper when you buy larger bulk.

You either mix what you need or make a small concentrated bottles to quickly mix with water like the aerogarden liquid nutes.

Alternatively, to prevent mold etc inside your open bottle of nutes just put it in the fridge.

I like to start in water gardens, over the last couple of decades I've collected a few of the AeroGarden water gardens. However, I do also use soil cells and have found that mixing the Aerogarden liquid plant food works just as well on those when mixed in the watering can.

Sometimes Aerogardens website has it on sale, other times Amazon is cheaper. Unfortunately I've never seen it in stores.

Amazon Link...
https://www.amazon.com/AeroGarden-Liquid-Nutrients-1-Liter/dp/B004M5NGJG