Asslam o Alekium.bhai kahan se pakar lia ye tile wala hamain bhi time dilwa du is se hum bhi kuch seekh lain is se,
I am doubtful about tile wala, baki lets get to tge point
Bond should not be used for flooring.
Only cement should be allowed to use but the cement ratio should not be very high.
In washrooms there is no way water can damage the tiles therefore bond has to be used but only for walls, again when it comes to flooring, use cement.
About tile gap, it depends on the tile what kind of tiles you are using but if there is no Groove needed then you can use plain