That’s in part because McDonald’s filters their water many times over to maintain consistent flavor and quality. How shall I say this......BULLSHIT! Many times over my posterior, the water is filtered through standard filters which are used by probably every other large retailer selling sodas.
In addition to pre-chilling their syrup and filtering their water through an advanced system, McDonald’s also keeps the water for their sodas incredibly cold. Insulated tubes carry water that’s stored at just above freezing from the fridge in the back of the restaurant to the fountain drink dispenser in the front. That's a new one on me, In the three restaurants I ran all were equiped with Multiplex beverage systems which used a chilled water bath to supply the cold water as well as the low temperature require to carbonate it, and none of it went through the walk-in. https://mcd.welbilt.us/Brands/Multiplex
The temperature of the water is also optimized for peak carbon dioxide (CO2) levels. Indeed, CO2 doesn’t escape as easily from really cold liquids, Let's chalk this up to no shit Sherlock, it's called basic beverage science and why when the chillers are down you get warm flat beverages where ever you are!
And don't even get me started on the straw bullshit, the straws are round, measured in their diameter, not wideness, and are the diameter they are so you can suck the, what used to be thick tasty shakes through them and had nothing to do with the sodas.
Okay, I ranted enough, it pisses me off when people make shit up about something they have no real knowledge of.
We still deliver Coke in tanks. But most customers uses Bag-In-A-Box. It’s more convenient.