Should I add any material to the water to prolong the freshness of my Christmas tree?

FAQ
Question: 

Should I add any material to the water to prolong the freshness of my Christmas tree?

Answer: 

Do not add molasses, sugar, soft drinks, aspirin, or commercial products to the water. Additives provide no real benefit. The keys to keeping a Christmas tree fresh are to place the tree away from any heat source (fireplace, heater, radiator, etc.) and keep the tree reservoir full of water. Check the tree reservoir at least once or twice a day. Fresh trees absorb large quantities of water (especially in the first few days). If the water level drops below the bottom of the trunk, water uptake will be drastically reduced or cease when the reservoir is refilled.