Netto at CPH
 

There appears to be a Netto supermarket just outside of CPH airport. Is this something I could reasonably walk to within 15 minutes from CPH Arrivals? I have a 2:30 layover between flights transiting CPH and would like to purchase some Tuborg Squash and sweets for my children who absolutely love the stuff, but we can't easily get in Canada. My plan is to check the bag I normally carry on after shopping because bringing the soda through security would be problematic given the quantities I'll be purchasing.

Yes, I think that would work, but dragging a big bag around may prove harder than you think

You could also take the free intra-terminal bus towards P15/P19 and get off at Nordvagten (the staff entrance - right across the road from Netto). Every 10 minutes during the day outside arrivals in T2 and T3.
https://www.cph.dk/en/parking-transp...i/terminal-bus

I don't think Tuborg Squash is in Netto's everyday assortment anymore, neither ½l nor 1½l bottles, though possibly as "spotvare" (bargain item) if you're lucky. You may have better luck in the WH Smith or even more the 7-Eleven shops at CPH (at least for ½l bottles).