Veenaji, the image of the water bottle is required only once. The same image can be charged daily.
If you don’t have the image, you can simply write on a paper "My fatherinlaws water bottle"
If there are 2 bottles of different colours , then specify the colour on paper.
This written paper becomes the water bottle for your charging.
Daily fix a time when he fills his bottle, and then you charge on this paper the same way you charge real bottle.
This is the beauty of VK ….