My elderly neighbor has a couple loose tiles on her front stoop that she's been worried about for a year, they are intact but loose and one is cracked. THey are thin terra cotta tiles that are maybe less than 3/8ths thick, and the stoop is brick and cement. Is there something that would be very simple, like a masonry cement or something I could just squirt under there and give it a quick fix for her? Or does this have to be done with mortar and etc and be a more involved process? If I recall correctly there is a mortar-like grout between the tiles which is missing/broken around these broken tiles. But I think she'd be fine with it if I could just stick them down. Any suggestions?