I'm registered to vote in California. I'm going to be leaving my apartment behind to start traveling. I'm not staying in any one state for long enough to count as a resident.

How do I vote?

(I'll be in Pennsylvania at the time of the election, but I'll have only been there for 11 days. Everywhere I read says just to re-register, but I'm not eligible since you need to be in PA for 30 days to vote there. I'll have lost my resident status in California after 15, and everywhere else I travel in the next two months will be roughly 7 days a state, first in Washington, then Oregon, then Illinois.)