Its a fluid block. you need mcpatcher to change water or lava.
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There is no special 'swamp water' in vanilla Minecraft. All of the water there is the same as the normal water in the rest of Minecraft.
Craft a bucket and Right-click on the water with the bucket.
No, mobs will not spawn in water or ontop of half slabs.
Water can flow a total of 8 tiles.
The only mob that can spawn in water is currently a squid.