I bought something similar - not Nestle - for DS when he did his D of E practice expedition. It was March, freezing cold, and I was in protective mother mode. I bought those little porridge pots which you just fill up to the line with hot water and each.
Yes I could have put porridge oats into a wee bag and sent him with a plastic/china bowl, but this was way easier. Way more expensive too - but worth it as a couple of times a year thing. If however you're buying one every day on your commute, it's not very cost effective.