I think blue buttercream icing would be fine. However, you could go into the Cake Central Photo Gallery and click "search" and then type in "toilet" and look at the different cakes and see which one you like the look of best.
I hope this helps!!! Happy Thanksgiving
You could also use piping gel tinted w/ a little bit of blue. Piping gel makes for great looking water!
I have read on CC that some people use piping gel with a bit of yellow icing color in it. Also, to get the real looking toilet effect
tootsie rolls or your favorite peanut chocolate bar in the "yello water"...
I hope I'm not too late. You can use the buttercream icing tinted blue and then spread a small amount of Karo corn syrup on top of the blue icing to give it a water effect.
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