Still thinking about it.
I did find useful information at
https://www.ritdye.com/ that told me I could use my front loader. They also have a color formula page that explains how much liquid dye to use in how many gallons of water with how big a load to get the color you want. I figured out the color I want is Coconut Milk, which requires 1 teaspoon of tan in 6 gallons of water to dye a sheet.
I'm sure the fiber reactive dyes are better, but I need something that is fast and easy. Even the washing machine method is a bit daunting for me since I rarely prewash yardage. I would need to prewash the fabric, follow all the precautions for adding dye to the machine, dry, and iron 5 yards. I have to decide if I dislike the super white that much.
I have a remnant of another white-on-white fabric that is absolutely perfect, but I've never been able to find more of it. When I place my colored pieces on the "perfect" fabric, it enhances all of the colors. The super-white is okay, but does not have that same effect.