I'm making a princess castle cake for a 4 year old and I want it to look like there is water around it. What do I use?

I'd probably use various shades of blue buttercream. I really like to carve out the cake and use a blue jello mix for water but you won't be able to do that if it's going around the cake. You could make blue jello really firm by adding less water and unflavored gelatin to it and let it get hard and cut it up and lay it around cake too, if that made any sense! Depends on what the cake is on and the look you want I guess.

I like the look of blue piping gel for water.

I use melted sugar and blue food coloring. I put down aluminum foil. Note: I put the aluminum a little crushed, so it looks a little more wavy.

You can melt neon blue gummy bears and pour into an iced divot. It does take a LOT of gummy bears though and you have to work fast.

i also tint piping gel blue

There is a recipe on www.baking911.com where you can make your own piping gel using knox gelatin, water, and light karo syrup. It makes a clear gel and you can tint it to the shade of blue you like.

It looks like the link is blocked. Basically, it is 1 envelope knox gelatin, 1 tbsp. water, and 1 cup light karo syrup.

You could use blue RI. It wouldn't be shiny like piping gel but it would dry hard so easier to handle if it's on the edge of a cake board.

Didn't know about any lawsuit. I was actually referring to another website. I don't know whether it was part of that company or not. My recipe was just half of the one you posted.

piping gel works great, look at my boat pic for example. It was fun. I love piping gel.

I love mixing piping gel with blue coloring for a water effect. I try not to over mix it because the color striations are beautiful!

if you choose not to use the blue buttercream idea, might i suggest using piping gel colored blue, this will give a really realistic water look. hth