Using this dried watercress, do you suggest I can steep it like tea for a few minutes, or powder it, or make an infusion overnight?
Dried is great. You do not need to extract it first. I just put powders under my tongue (1/2 teaspoon) take a big mouth full of water, swish the herbs around and swallow. Quick, easy, no mess and no heat to destroy any of the nutrients like making teas will cause.