Thanks for the link. Did you buy your water bottle fan, or did you make it yourself? I remember we used to have these water cooler fans before the air conditioner came along, but they weren’t homemade.
These are hand held water bottles with fan attached at the top - mine use two AA batteries. These are usuallly call sport fans, bicycle guys and tennis players use them. Most of them are junk. Mine are Squeeze Breeze, not junk.