Gotta be totally immersed in the name of "Jesus",
that is,
Obsessed with the salvation of the world.
The water is just a symbolic gesture and not necessary, the way "baptize with fire" is not physically necessary.
At least, I've never seen a preacher dunking people in a literal fire.
Personally, I think getting physically baptized in water is a pretty cool thing though.
But you probably shouldn't worry about whether or not someone else is physically there for the real immersion, as long as Jesus is there.