Basic expenses for a retired couple

Assumptions
Mostly cook at home, occasionally eat at hawker centres, food court and restaurants
No car
HDB flat fully paid. Debt free
No drinking, gambling and smoking
Low cost or free recreational activities
Lead a healthy lifestyle with exercise and cooking healthy meals

Food and groceries $800 pm
Utilities $200 pm
Public transport $100 pm
Medical insurance $600 pm
Recreation $100 pm
Holidays $300 pm
Miscellaneous $400 pm
Total $2500 pm ($1250 pm for one retiree)

Passive income can be from CPF Life, dividends, etc.