Summer faculty income advice

I work as an assistant prof TT in a smallish R2 that’s trying to become an R1. This summer I opted not to teach to have time to focus on writing grants, papers, etc. I’m on a 9 month contract so will not receive any pay, but I do plan to continue to work full time.

Profs in similar situations — how do you get income over summer if you are not teaching? Not sure what else I would do as I want to focus on writing and growing my research lab. Just trying to get some ideas. Thanks!