What Is The ONE Product You Would Swear By/Can't Live Without?

Cool, I was just about to BUMP this thread, but I saw that someone had already posted.

Would have to be tea for me also... but that consists of 3 products, mycogrow soluble ancient forest and molasses, so kinda cheating.

Ok, to pick one additive I would have to say mycogrow (or great white).

Aquashield and Silica blast......I also like floralicious plus

Hygrozyme will be in every grow regardless of what nutrient company im running.