That's going to be more of a Jadam process with a water extraction. Generally you'd gather up whatever you need in a bucket and cover with water and let it steep for a while. With Jadam it's just a cold water process and you let it go for weeks to months and it can stink to high heaven. BUT, you can speed it up with hot water. Boil enough water to cover your chopped up greens, and let them steep for a bit, just like making a tea you would drink.
Once it cools, dilute it 1:10 or so with water.
@bobrown14 gave a recipe for horsetail fern tea in one of his threads and he stores the excess in his fridge. I think he said it will keep a week or two that way. But certainly easy enough to make a fresh batch when you need it (unless the snow is flying, lol).
Keep in mind that you will only get you the water soluble goodies this way. The better way is to do a KNF type brown sugar extract following
@Emilya 's
Emmie's Backyard Fermented Plant Extracts From Dandelions! thread. That way will take a week or two at minimum.
Doing it that way you can make enough shelf stable and super potent extract to last the whole year. You also get all of the water soluble stuff PLUS everything else. The dilution rates for this stuff is generally 1:1000, although I usually use 1:750. At that usage rate its 1tsp per gallon. Or, looked at another way, 1 liter of extract makes 750 liters of infused water for yor plants. I've got a thread going where I show the various nutrient levels extracted from a few of the super accumulator plants using this sugar extract method including dandelion, comfrey, nettle, horsetail fern, fish, etc.
In any event, lots of ways to get at it.
Azi