There are different ways you can use to get rid of water in Minecraft.

Here are your options:

1) Replacing water source – find the water source and replace it by placing a solid block on it.

2) Using an empty bucket – craft a bucket by placing three iron ingots in a V shape on a crafting table, with the bucket in your hand, find the water source and right-click on it.

3) Using a sponge – the sponge block only generates in sponge rooms of ocean monuments and can absorb water in a seven-block radius. When it becomes a wet sponge, you revert it to a dry sponge by smelting it in a furnace.

4) Using sand or gravel – sand and gravel are affected by gravity and will start falling if the block under them is removed. You can use this feature to remove waterlog in a deep area. Hold the sand, spam the right-click button until the hole or a deep area is filled with sand, then remove the sand using a shovel.
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5) Using lava – When lava touches a water block, it turns it into stone, and if it comes in contact with a source of water, then the water source becomes obsidian.

Source: https://www.sportskeeda.com/minecraft/top-5-ways-get-rid-water-minecraft

Hope this helped.