Minecraft 1.12.2 fill a lot of water at once Creative mode?

Jo moin, I asked the question before but I think I have it if bennant ^^ I want to fill a lot of water all at once on a flat card, dump a bucket for hours and build something so that I don't have any holes in it ^^

I think the creative mode is not enough for this, you need a tool like World Edit, which, however, requires rights on the server.

If you play a Tekkit variant, you could clumsily build an endless water source and use a pump to pump the water into your pool or whatever.

Ice cubes would also be a variant you could work with, depending on the biome it takes until they turn into water.