The nettle needs to be fresh and soft. Remove any roots and. You can separate the leaves and use only them if you like.
Wash the nettle thoroughly under running water to remove all the dust. You can use a strainer to help you.
Put nettle in deep container and pour boiling water over it, leave for 10 min. Strain using a slotted spoon and fill suitable jars with it, you don't have to press hard.
Add 1 tsp salt per jar.
Pour in mineral water up to the rim of each jar.
Close with new caps and sterilize for 10 min.
Store the jars in a dark place.