I am 2.5 weeks into flowering, what nutrients should I get?

I have 3 gallon containers and 4ft tall plants, (one is a sativa and 5ft or so), I am curious whats easy to get at home depot or a plant store that would work well.

My soil is the Miracle Grow Moisture Control type and the 4 ladies are running under a 400w HPS lamp.

I feed mine Miracle Grow Bloom Booster, for the flowering. Or you need phosphorus nutes to help with the flowering.

Earth juice bloom and catalyst. Great Products. Organic

Hate to rain on your parade but you really should get everything you need before the grow. You won't believe how many times the factory burns down, or there is a massive shortage of your normal stuff the one time you don't plan ahead

I recommend fox farm's neuts they seem the work best for me!
Buy Foxfarm Nutrients & Hydroponics Plant Food