(JRE apologises for the dismal pun in the title.)
Singapore’s a cheap place to eat – if you know where to go.
Find a hawker centre, or one of the hawker-ish food courts in the bigger malls (Wisma Atria on Orchard Road has a good one, and there’s an OK one in Raffles City). Track down the Hainanese chicken rice stand, and order a plate. (Don’t forget to grab some chilli sauce and soy sauce to go with it.) You get a decent chunk of poached (and very yummy) chicken; a big helping of ginger-flavoured rice, and (usually) some cucumber slices.
It’ll set you up for lunch or dinner, and it’ll cost you, at most, S$4.
(Another money-saving tip – the little money-changing shops in Raffles Place charge about one-tenth the spread that you’d pay at a bank. They’ll be 60 to 100 points wide in AUD/SGD, whereas you’d pay 400 points at a bank, or 600 to 1000 points at, say, Melbourne Airport.)