Place Brats, Butter & sliced onion in a decent size kettle.
Pour in the Beer & the Water. (You can use only Beer -- just be sure the Brats are covered, completely).
Bring to a boil.
Reduce heat & cover.
Simmer for 30 minutes.
Remove from heat, but DO NOT remove cover until ready to grill!
Get your grill ready & when it is ready, drain the Brats (reserving liquid) & put on the grill & cook until golden brown. (Place them back into the warm Beer & cover to keep them warm, if needed).
Serve with or w/o a bun, with Kraut, chopped Onion &/or some Silver Springs Horseradish-style Brat mustard (NOT that bright yellow Stuff -- YUK) Be sure to have some extra ice cold brewski's to enjoy the Brats!
This recipe can be adjusted either way, to fit your needs!
You can also broil these if the weather won't permit grilling.