Yes, crystalized honey can be saved with a combination of heat and water. The trick is using low concentrations of both. Your honey has solidified because over time the moisture has escaped and the sugars have formed crystals.
Add a tiny amount of water and break up the large crystals if possible to speed the process of dissolving the sugars back into solution. You can apply heat to the crystal solution via a water bath or microwave to help break down the crystals. However, you won't need much heat and a few seconds in the microwave should be ample. Do not over heat it (particularly if it is in a cute cheap plastic bear bottle that deforms under heat quickly). Your best bet is to add tiny amounts of water and heat, mix the solution and wait a bit. Repeat as necessary. Time is your friend, turning your honey into a boiling soup is not.