What are Your Monthly Expectations

Assume you will spend SGD4 both ways entirely by MRT and bus in combination for work in a day. Then throw in occasional taxi rides probably about SGD100 (maybe for those odd grocery shopping trips) in total in a month, since you mentioned you don't go out drinking. And do your math. That's for your transportation alone. Food-wise, for a single person, I would spend around SGD300 (considering SGD10 per day x 30 days) eating out cheaply and occasional cooking. Multiply that figure by two for your wife and you will get the estimate. Still that entirely depends on your diet and preference.