Debbie Brown colours piping gel blue and swirls this around with a spoon to create water. I have a rather ancient book by Jane Asher who created something she called "toffee glass" for a bathing pool, heres the recipe:
Heat 250g granulated sugar in 150ml water until sugar dissolves. Bring to the boilmtill you reach the "soft crack" stage before mixture starts to colour. Remove and use immediately. I think by "soft crack" stage she menas when droplets set in cold water or if you could use a sugar thermometer. She made a blue coloured icing with water and seived icing sugar which she poured into her pool and added the toffee glass after the water icing had set. This gave a sheen to the water and it crystallised a little making the water look turbulent. Hope this helps, Im sure there are many ways of getting the effect you want
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