After @Will talked about soaking dry manufactured tortoise food in hibiscus water, I bought some of the organic petals. When I soak them overnight in water, the result isn't nearly as red as the pictures Will showed in his thread. Maybe I bought the wrong stuff. I'll try to find his thread for you.
I soak it in as little water as possible overnight in the refrigerator and chop up the flowers and add to food, I also use what is then 'cold brewed' tea for other things, like lettuce butts, the layer crumbles, etc.
My price beats all others I have found on the internet including Amazon Prime. My price includes shipping, and it is literally the stuff I used to make those crumbles so bright in color.
@Will : When you motor north, please bring me a half pound of the hibiscus petals. The dried petals (for tea) that I purchased online, don't make the water red enough.