How do you follow the TX home school laws with “unschooling” if the law says you need a written curriculum?

Can you answer MommaBear4474’s question about Homeschooling?:

I am starting to home-school my six year old this year and want to make sure I am following the laws in Texas. I know “unschooling” is a form of homeschooling and there is not a law against it, but I need to know how to go about “unschooling” when according to TX laws, a written curriculum must be followed. How does one accomplish this?

Homeschooling Curriculum Reviews