When you need to go out for essential reasons (e.g. to go to the supermarket), take public transport. spend less than 45 minutes at each location, and your trip could be counted as a single journey rather than two-way (cheaper!)
for this hack to work, u need to make sure there is more than 1 way to get to/from your location, as you cannot take the same bus back. you cannot also exit and enter the same mrt station.
home --> bus 88 --> destination (max 45 min) --> mrt --> home. $1.22
home --> bus 88 --> destination --> bus 88 --> home. $1.84