LX 22 was stranded for 4 hours on the JFK Tarmac waiting for a gate to clear on Saturday 6/1/2018. The flight was totally full given the previous cancelled flight. I was sitted on row 23J with full view on business. After 1 hour wait I saw the crew moving many bottles of water out of coach into business. I assumed this was because business class hadn't any left. Shortly after my 11 year old daughter who had a bad headache asked for water but she was told there was strictly none left on the whole plane. I saw multiple people in business classe getting glasses of water on many other occasions but each time I was told they had just found some but that was it. When the gate was finally announced and there was just 30 mins left, the crew moved back 5-6 bottles of water from business to coach. During 3 hours, no one in coach got water after a 9 hour flight. Do you think this is acceptable? and just protecting high value costumers or is this morally wrong (at least give old people and children a bit of water in coach?)