April 5th, 2022. 4:50 pm. 

Initial Eau'dometer reading: (9, 886.2 mL).
Found: Tim Horton's on Woodlawn Avenue West in Guelph.
Description: Egads! A variation on the water hostage vessel: A cup of water abandoned on the table at the Tim Horton's on Woodlawn Avenue West in Guelph. About 500 mL.
Results:  I decided to use it as a planting cup for my sweet potatoes: I'm growing slips for this year's crop.