Can I take a 220 line and convert it to a regular house outlet what would be the damage?
If it's a 4-prong receptacle, then you could do it. Though you'll have to swap out a breaker in the panel. This will leave you with a 20 ampere multi-wire branch circuit (MWBC), which can be used to supply countertop receptacles.

If it's a 3-prong receptacle, there's likely not a grounding conductor. So it's not going to be a good idea, though there are ways to do it.

As it sounds like you don't want to modify the existing wiring, this probably isn't a project you want to tackle.  A local licensed Electrician should be able to do it for you.