Re: bring lunch to uni?
I found a good trick to be, pack a lunchbox with separated sandwich fillings in the morning, then stop at the supermarket or bakery on the way to uni and grab a fresh bread roll/extras. Tear open the roll and shove it all in there at lunchtime and there's your gourmet lunch right there, for, like... 50c. None of that soggy left-all-day sandwich crap.
Picking up a drink at the supermarket rather than at uni saves $$, too, if that's your thing.
Lunch bought at uni is (usually) terrible and a huge drain on the wallet.