I think the urgency of the situation is such that I'd get him to prioritise getting and storing that 2 week supply. With a bit of creativity, there are all kinds of ways in which you can stash stuff, although I accept that student halls is probably going to be at the ultra-pokey end of the spectrum.
And I'd recommend that a lot of the stash is "boring" food - the kind of thing his new mates aren't necessarily going to be all over. So leave out the ambrosia creamed rice, and go big on baked beans. Pasta is good. Ideally, the only stuff he needs to shop for regularly is going to be fresh (and I suspect that not a lot of that will get eaten!).
I reckon it'd be worth putting together a food parcel, and then getting Hermes to ship it. I suggest you include a supply of multivitamin tablets, while you're at it - lots of students end up with deficiencies in the first weeks and months, if they're self-catering and living on cheesy chips and toast