Water temperature and quality matter more than claims about rearranged molecules. Let hot water cool before considering it for a plant.
Let hot water cool
Do not pour hot water onto a plant's roots or foliage. Water near room temperature avoids a sudden temperature change around indoor roots. Check the water source and the needs of the plant rather than choosing water for a supposed change in its molecular arrangement.
What boiling does not tell you
An old claim that boiled water has a structure matching plant cells is not a useful watering guide. It does not establish a special benefit for flowers, leaves or branching. Water quality and the way the growing medium drains still need attention.
Check the pot first
Before watering, assess moisture below the surface and the weight of the container. Use a routine suited to the species and its growth. A pot that remains saturated needs better root conditions, not a different household drink.
Related reading: Beer for Plants: Watering and Feeding Are Separate Jobs.