You can add food coloring to fondant. Wear gloves and add liquid color, knead well. You may have to add more sugar and/or cornstarch to adjust for the extra liquid. You can also use powdered color.
Also, you can paint the color on the fondant.
Fondant pieces will stick together with just a little brush of water-just a very little. You won't want to make is soggy or melt it.
I recommend using gel colors to tint your fondant. Since these are not liquid you don't need to add sugar or cornstarch.
These is what I do: make a ball with your fondant and then press it to form a 'pancake'. With a toothpick add a couple of blobs of gel color to the center of the fondant 'pancake' (amount depends of the intensity of color). Fold in half. Press. Fold in half and press. Repeat this until you feel that the gel color has incorporated into the fondant. Once this is done, press and then stretch the fondant until the color is homogenous throughout.
Check my blog for more information on how to work with fondat: www.thecakestylist.blogspot.com or to get recipe for marshmallow fondant.
in order to 'glue' fondant to fondant I would use the clear vanilla/butter flavoring (somehting that contains alcohol) instead of water. Water tends to dissolve the fondant. Alcohol products evaporate quickly drying the pieces together faster. I am sure you have flavorings, if not, use some vodka.
I hope this is helpful.
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