http://www.taxnomad.com/tax-friendly-countries/singapore-history-and-general-information/tax-rates-and-laws-in-singapore/
T2 to T3 transfer does not operate between 2.30am and 5am
Veganism:
Terminal 2 Level 3: Kaveri
Terminal 3 Level 4: Bikanervala
Terminal 4 Level 2M: International Food Hall