Most Type S Mortar mix that you can use for grout comes in a powdered form that you mix with water. You will need a five gallon bucket, a hand drill and mixer attachment, your bag of mortar and water.
Add about 2 inches of water to your five gallon bucket. Dump in half of the bag of mortar mix.
Attach your mixing drill bit to your hand drill. Mix the adhesive until all of the powder is incorporated. Start slow and then speed up as the powder mixes in.
Let the mixture sit for about five minutes and then give it another stir. The consistency should be similar to cake batter. Add additional water or mix to get the desired consistency.
Only mix as much as you need. Don’t mix more than you can use in the next 30-40 minutes.
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