Most grocery store chains have RO stations were you can use your own gallon or five gallon milk or water bottles and refill them. In my area they all charge $0.39 per gallon.
If they will give you access to the person they got the cham from and that person can give you all the answers needed for you to make a well informed decision I'd say go for it.
Main reason would be cost. Incandescent blubs are much less costly and can be controlled by a cheap dimmer to allow for the correct basking temperature.