https://www.nsrcc.com.sg/bungalow/layout-map
https://www.nsrcc.com.sg/bungalow/singapore-country-clubs-booking-procedure says
* minimum 2 nights
https://myresort.nsrcc.com.sg/asp_bungalow_app_single_new/EnquireAvailableRooms.asp shows most weekends are pre-booked well in advance.