Step 1 Protect bath with drop sheets.
Step 2 Wearing safety goggles and gloves, use hammer and cold chisel to knock out broken tiles
Step 3 Mix 4 parts water to 1 part BondCrete.
Step 4 Mix Sand & Cement mix with water to make cement render.
Caulk is best suited for patching small holes on ceramic tiles, not large holes. Look for a blend of acrylic/latex and silicone for best results. Silicone adheres better to ceramic tile than acrylic, but the addition of acrylic allows the caulk to be painted.