If you haven't used the bucket, and you got it locally, you should be able to change it for a drilled lid.
Drilling a hole and inserting a grommet is also easy, but you have to get the grommet, and have the right size drill bit.
Getting another carboy is even better as you can have two brews in primary at the same time.

(but if you go that route, you should get a 6.5g carboy or be prepared to handle blow-offs)
-a.