If you want cheap Asian food for every meal, then you will find it readily available here. If you want cheap Western food (of any quality) then you're out of luck. It's just another example of 'When in Rome...'.
For example, a parallel, if I were happy to live on M+S ready-prep meals, they're both relatively cheap and good quality back home. And that would cover everything from a British roast beef meal, through their very long established 'Indian', 'Chinese', and 'Thai' ranges, to more recent cuisines (to the UK market) such as 'Indochinese'*. All the '''s are because although they go a good way to making them authentic, they tend to round-off some of the blunter very authentic edges, that might not translate to the mainstream market back home (leaving the shells on prawns in a dish, or bones in/skin-on for example).
More broadly, if you were say from the Subcontinent, then you might find that you can live something akin to back home over here, just with higher rents, but lower taxes. If you are of Western origin and tastes (culturally), then you can find yourself constantly fighting the tide, if you want everything to be just like home. That goes beyond dining, that includes things like the taxes on alcohol, and cars, which can take a significant chip out of SGs status of being considered a low-tax country.
*Which has me curious as to what ranges they might have launched since I have been away!
--- Note to Mods. Twice while editing this post in edit mode, I've clicked on a word or letter ('culturally', and 'that'), and it opened a new tab with the ISS International Schools website on it...
