<<Disclaimer: Verify this information before applying it to your situation.>>

For those who can't find a gf ricotta brand in their stores, The NY
Sunday Times magazine includes a recipe this Sunday.  I've adapted it:

7 1/2 cups fresh whole milk
1/2 cup heavy cream
1 cup plain yogurt

Line a mesh sieve with several layers of cheesecloth.  Place in large,
high bowl.

combine milk, cream & yogurt in pot over high heat and bring to a boil.
Reduce heat and simmer until milk begins to curdle, about 2 min.
Our mixture into cheesecloth lined sieve and let drain until firm, about
1 hr.  Then refrigerate

I suspect that you could probably omit the cream, but may have to
substitue dry milk powder to "beef it up"