An anti-transpirant is helpful in keeping your tree fresh. If the trees were not treated in the field, you may want to treat it yourself. Keep in mind that all trees can consume large amounts of water. But the Leylands and Sapphires are unbelievable. You should expect them to consume 2-3 gallons per day.
Water consumption decreases as time progresses.
The extent to which you care for your tree will determine it freshness during the Christmas season. Christmas tree safety is very important and its your responsibility. There has never been a case where a Christmas tree auto-ignited. Most fires originate from faulty wiring in the lights. Before you string the lights on the tree, test each string.