1) Is it true that if we move our feet during masah, the wuzu becomes batil?

2) During masah, if drops of water fall on our dry feet, do we clean them, and then do masah, or we can just masah normally even with the drops of water on our feet?

1) yes it is true this is the ruling
261. While wiping one’s hand and feet, it is necessary to move one’s hand on them, and if the feet and head are moved leaving the hand stationary, wudhu would be void. However, there is no harm if the head and feet move slightly, while the hand is be ing moved for wiping.
2) Feet should be dry