Prepare the fruit.
Combine fruit & water (if planned).
Add preserving sugar & mix thoroughly.
Add vanilla bean (if planned).
Let the mess chill for about 1-2 h.
Clean the jam jars.
Bring the mess to a boil & cook for 3-5 min (depending on the recommendation on the package of your preserving sugar).
Discard the vanilla bean (if swimming in the mess).
Fill the jam into the jam jars, close the twist-off cap & put upside down.
Clean all jam jars (from splilled jam) as soon as the jam is at room temperature & store them in a dark & cool place.