Drywall mud is not commonly referred to as a mortar but people can also use it as a bathtub base. This one is pretty simple. You can buy a container of pre-mixed drywall, add in water. As a result, you can have a completely effective mortar base.
Jul 15, 2019 · Non-Toxic Thin-Set Mortar. Thin-set is the bonding layer that goes down under your tiles. Concrete based thin-sets are the safest type and are also easy to source. Brands. I used Custom Building Products Standard Thin-Set Mortar which is zero-VOC (and mildewcide-free). It had a light “wet concrete odor” when wet but it is safe once dry.