Xeramtheum said:Hi and welcome to NGA!
It looks like it got dried out. Was it directly in the air flow path of a heat register or perhaps a cold draft from the window?
Sorry you are having problems with your maple. I think it's unlikely the water bottle was the problem, it may just have been that it got watered too late. It may be shedding its leaves to save itself (because the leaves use the most water), or it is shedding its leaves because normally a maple has a period of dormancy during cold temperatures in winter. Some deciduous plants don't do well if deprived of their winter cold dormancy period.
Unfortunately replacing the soil and fertilizing it were not the right things to do because that makes it even harder for it to take up water. About all you can do is keep the potting mix damp but not wet (I hope you used potting mix and not garden soil) and keep your fingers crossed. Does it look like there are any new buds at the base of the leaf stalks?
sooby said:The pot looks (and pictures can be deceiving) a bit big for the plant, and it also looks to be filled a little too high with potting mix which makes it harder to water. One thing to be careful of is that if the potting mix gets too dry, especially if peat-based, you can water but all the water will run out of the bottom of the pot without being absorbed. If that happens the best thing is to set the pot in a tub of water until it has rehydrated. I don't know if that's your situation but I wouldnt even go so far as to say keep it moist, I would just keep it from drying out too much while the plant doesn't have living leaves. Can I ask why you are keeping it indoors in a pot? It would be happier outside, depending on species and hardiness zone.