Here's the recipe of fondant glue that I use:
8 tablespoons of boiled, cooled water
1 teaspoon of CMC/Tylose
Combine the two in asmall jar and refrigerate overnight. Do not worry about mixing the two or shaking the jar up etc...just let it be in the refrigerator and in the morning you will find a lovely glue. If its too thick for your liking, add a littl;e water and if you find it thin, add a little CMC/Tylose as you like!