Tongue Twister /b/ & /w/

Betty Botter had some butter,
"But," she said, "this butter's bitter.
If I bake this bitter butter,
It would make my batter bitter.
But a bit of better butter,
That would make my batter better."
So she bought a bit of butter –
Better than her bitter butter –
And she baked it in her batter;
And the batter was not bitter.
So 'twas better Betty Botter
Bought a bit of better butter.