How do you spell britis?

If you are asking how to spell "Britain" (the country) then you spell it as I just wrote it.

On a lighter note:

Britin is spelled:

B as in Britain.

r as in Rascal.

i as in Intense.

t as in Theodore.

i as in Intense yet again.

n as in Normandie

That is how you spell "Britin".