One way to attach a towel bar to tile without drilling is to use adhesive hooks or strips. These can be found at most hardware or home improvement stores and are designed for hanging items on tile or other surfaces without causing damage. Simply clean the tile surface, apply the adhesive according to the manufacturer’s instructions, and press the towel bar into place. It is important to ensure that the surface is clean and dry before applying the adhesive and to follow the manufacturer’s instructions carefully to ensure a secure hold.