How to turn swamp into normal water in Minecraft PE?

I would like to build something on the water, unfortunately this is a swamp. Can you somehow make clear water out of it?

You can't, but you can color the water in the kettle. Also in all colors, but this changes again when you put it in a bucket.

What a shame, thank you very much!

That will not do. The swamp is a biome and you can't change that. As long as the water is in the swamp biome, it has the other color