Little India has the choice of eat cheap, drink cheap and sleep economically. SGD 100 for 3 pax for food and drinks per day excluding tobacco and alcohol is sufficient. Transport cost say about SGD 90/day for 3 pax. Attractions, it depends on what you wnat to see as they are the killers to your shoestring budget. Cheapest would be visiting the Hindu temples, Chinese temples, Botanic Gardens (excluding the Orchid Conservatory) and Gardens by the Bay (excluding the two dome conservatories). They are entry fee free.