Chords are kinda convoluted but I try...

F
  Singing in the bathtub
  Dflat
  Happy once again
  C
  Watching all my troubles
                        F Eflat Dflat C
  Go swinging down the drain    

F
  Singing through the soap suds
  Dflat
  Life is full of hope
  C
  You can sing with feeling
                        F G Aflat A
  While feeling for the soap.    

A
  A ring around the bathtub
  E
  Isn't so nice to see
  A
  But a ring around the bathtub
  D       G       C
  Is a rainbow to me

Reaching for a towel
Ready for a rub
Everyone is happy
While singing in the tub

Why am I delighted
Why am I so gay
Why am I excited
Oh, what day is today

Pardon my elation
Everything's all right
I get inspiration
Every saturday night

Singing in the bathtub
sitting all alone
Tearing out a tonsil
Just like a baritone

Never take a shower
It's an awful pain
Singing in the shower
Is like singing in the rain.

Oh, there is dirt to be abolished
But do not forget one thing
While your body's washed and polished
Sing brother sing!

You can yodel opera
Even while you scrub
Everyone is happy
While singing in the tub.

THere is a bridge in the R Crumb version that goes something like F Aflat Dflat G C F

Hope that helps

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