That is really good to know, that RLI offers that kind of coverage!
I am not a business-crafter that has insurance... I'm the assistant of an insurance agent who sells a lot of commercial insurance policies.
I don't handle a lot of the commercial jargon (I deal with the personal-lines stuff like cars and houses) but I was going to project that you probably just want a basic BOP - it stands for business owners policy, and if it's just you and no employees, a little BOP can cover all sorts of stuff. I think they generally run around $500 annually, but that might depend on the state.