OK....so if you're feeding 2 in veg, just mix up 10ml of drench plus 7mils of Transplant plus 3mils of tea in a gallon of water and feed both plants a half gallon. That's your formula.
That's pretty much what I do...the math is second nature now.....I just add 5mils per plant of drench.
Again, that's the minimum drench that works well for most applications. Some strains might adjust upwards....also, once you get familiar with the products you might make your own custom feeding schedule.
Dunking plants in veg.....try using a stronger Growth Energy drench to get strong, thick stems and better clones.
Watering in bloom.....in a typical 7 gallon pot, I'll use a gallon per plant, maybe 1/2 slowly poured down the top, the rest in the saucer.
The reason I list the intructions per sq. ft. is because the products are designed for sprayers, fertigation, etc. They are perfectly adaptable to larger scale greenhouse ops, farming and the like. Lots of folks are using hose-end sprayers to water their gardens....1 or 2 oz per tray, in the sprayer.....that sort of thing.
I edited a mistake above: I said 10mils per plant and I meant 5. 10 won't hurt....but it might not help much. Start with 5 and adjust upwards if necessary.
Remember, the drenches aren't "plant food." They are microbe food. The minerals and the foliar sprays provide the nutrition. The drenches provide voltage...literally.