My guess would be piping gel.
Yes. That.
Hello. To make water i usually put down blue icing first then pour the Royal Blue Ready-To-Use Gel Tube on top of it and spread it around. Sometimes I will take a little of the Blue Sparkeling gel and add that to the other blue gel.
Hope this helps.
Thank you all so much! I usually just use blue BC and don't smooth the water. But I'm doing a waterfall and wanted to try this instead.
I couldn't find anything describing it on CC. When I googled this I got a bunch of results that said they used jello. I didn't understand!
I did a river on a cake a couple of weeks ago and I tinted piping gel greenish. I used tan buttercream under the water. It was the first time I'd used it, and I was pretty pleased with how it came out. The idea of actually eating the gel is kind of yucky though - to me.
Sometimes I feel doing a fondant covered cake, with icing or gel water, kind of takes me out of the piece. It just seams like two different mediums that don't seem like they go together. Does anyone else feel this way? So Let me know what you think of two that Ive done with water. The first one, I layed some fondant "waves" on the cake before I draped the white fondant on, I then used duffs green spray paint for some highlights, next I painted on blue luster dust mixed with vodka...I thought the effect worked well, I did a similar method on the pirate cake, except I just draped the fondant around the base.
well it doesn't look like my attachments went over, just click the photos button at the bottom of my post 
Hi,
In the attached photo, I used blue bc first and then used a mix of blue piping gel and mixed in a touch of green glittery gel.
http://www.cakecentral.com/cake-photo_1717148.html
Check out the main photo but make sure you check out the other angles too, you might see the shine on it better.
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