If not you can make your own mix with 4 parts sand to 1 part portland cement.
How to make a shower floor for tile.
Remove the drain cover and place a clean towel or rag into the drain before chiseling along the grout line of the center.
Make the smooth surface of the tiles rougher to create more traction usually done by using an anti slip solution add anti slip treads or stickers cover the tile floor with non slip rugs switch to non slip floor tiles only recommended if you re planning a full renovation.
Use a spade handle drill which works like a giant hand mixer.
Create the concrete mixture pour concrete mix into a bucket until it s about one third full.
Properly built shower there are a couple of options to create a shower floor for tile using deck mud.
Slip a flatbar into that hole and under the mortar.
Add only enough water to the dry mix to make a dry pack.
Here it is best to use premixed deck mud if it is available at your local home improvement store or tile shop.
Use a 3 pound sledgehammer to hammer the tile until it s dislodged.
Continue chiseling down to the waterproofing.