I think a reason why Tim Hortons coffee can taste really gross from some places is the municipal water supply in the area. I've had Tim Hortons coffee from different one's in Mississauga and all have have tasted so disgusting I had to toss them. Starbucks can be really hit or miss too. I think sometimes they leave the coffee for a couple of days in the urns and by that time its like drinking crude oil. Gross.