So, It is exactly the way how Tibiawiki says.
In the order to get Vial of Mud You will have to use Empty Vial on the Muddy Floor Tile. It will work on the "darker", cracked tiles.
Example- North from Edron- on the way to the Undead Cave where Sir Valorcrest spawns. (water splashed on the floor as I was testing something)
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