How do you find information on getting a home improvement grant from a local or government source?

If you are in the US, possibly

Community Development Block Grant Program - CDBGThe Community Development Block Grant (CDBG) program is a flexible program that provides communities with resources to address a wide range of unique community development needs. Beginning in 1974, the CDBG program is one of the longest continuously run programs at HUD. The CDBG program provides annual grants on a formula basis to 1209 general units of local government and States. This program is usually administered by your local city.

See the related link for further information.