Ask anyone who has ever had to remove a toilet, keeping the water from spilling out the bottom is extremely difficult. If the toilet tilts while lifting, water will pour out and onto the floor. This can be a problem in a bathroom remodel. I like to get a hefty bag worked under the bowl and raise the fixture carefully over into the tub where the water can be emptied.
While in the hardware store today, I saw this product that solidifies the water so that it doesn’t spill. This may require some more investigation before I feel comfortable trying this method.