You can find a comprehensive list of community resources and up-to-date health information online here(link is external). This is a living document that is updated regularly by Freedom Community Clinic.
You can find a list of health, housing, and other resources for undocumented communities online here(link is external) from Immigrants Rising. The California Immigrant Youth Justice Alliance is also regularly updating their website with a list of COVID-19 resources for undocumented Californians here.