Canon Colorado 1650 Operation Manual page 246

Refill the chiller (first design)
9. Lift the cover a little up and towards you (1), then lift it up fully and take it out (2)
10. Locate the lid on top of the chiller.
11. Pull to remove the lid.
12. Pour one liter of demineralized water from the bottle in the pouring can.
IMPORTANT
Use demineralized water, do not use any other liquid.
246 Chapter 6 - Maintain the system