AFAIK, the only online site you can see the type of meal service(B,L,D,S) on an SQ flight is if you make a booking on the SQ website and inside the booking details, click on the "My Meal" button to see what type of meal is being served on each segment.
All other websites I have seen (Viewtrip, Checkmytrip and the Star Alliance timetable) just list the meal service as M or Meal.