In the UK. McDonalds uses only organic milk in their dairy products.
In Normal Times, if you run out of organic milk on a Sunday afternoon, after 16:00 (and it happens), if you have a McDonalds nearby, you can grab some organic semi-skinned milk in 250ml bottles, which before the lockdown, was around 79p.
Nutritional info
https://www.mcdonalds.com/gb/en-gb/product/organic-milk.html
So, once McDonalds re-opens, this tip will mean that you can still have that tea or coffee, even when supermarkets are closed.