In Singapore, use the SilverKris Lounge - this is the dedicated lounge for Business and First Class customers for Singapore Airlines and Star Alliance Business/First class passengers. Not to be confused with the Krisflyer Gold lounge which is a separate lounge for Star Alliance Gold members.

You will most likely be flying from Singapore Changi Terminal 3. Here are some videos to help you picture what the SilverKris Lounge at Terminal 3 looks like.

In this visit, I had breakfast and a bit of lunch before my flight.

This video shows you how to walk to the SilverKris at Terminal 3.

I had dinner at SilverKris before my flight.

PS: Singapore Airlines doesn't give amenity kits for Business Class!