I always use hot tap water instead of room temp. I read somewhere that it absorbs quicker that way.
I just found this info on keeping a Christmas tree:
"Here's the "Recipe" for a TRULY Safe Tree!
Want a really fire-proof Christmas tree? One that will also keep its needles as long as possible? Your best bet is to cut it yourself while it's still alive and growing at a Christmas tree farm; it's a great family outing, and you'll start out with the freshest tree possible.
If you're buying a pre-cut tee, make sure its needles are nice and flexible--not hard and brittle--before you buy. No matter where it comes from, when you get it home, saw an inch off the bottom of the trunk and sit it in a big container of water, like a washtub or trough--and keep that container filled--a big tree can suck up several gallons a day. After a few days, that tree will be absolutely saturated.
(Forget our record rains; many trees are 'imported', and could have been grown in a droughty area, far, far away, and be very dry by the time you buy.)
Then give it a good shaking to remove dead needles--you'll eliminate a lot of the needle drop you see over the holidays this way; in fact, your shaken and 'saturatedly safe' tree should keep its needles long past the New Year!
OK--now, when you place the tree in its stand, be careful not to remove any bark around the bottom of the trunk--that bark is the only way the tree can suck up water; if you scrape it all off to make the trunk fit in the stand, the tree will quickly dry out and become a hazard. (Don't worry about the holes most stands make in the bark; they're not a problem.)
Position your tree far away from radiators, wood stoves and other heat sources. Use the biggest water container you can, and make sure it stays full--if it dries out for even a day, that tree will be unable to take up water again. But let's be honest--this chore is a drag! You get down on the floor, battle the bottom branches, and always manage to spill half the water on the carpet. On the other hand, there's nothing worse than a dried out Christmas tree--its just no fun when your living room carpet is replaced by a sharp layer of dropped needles!
That's why a clever new device caught my eye this year--it allows you to keep that reservoir full by pouring water into what looks like an ornament on the tree; yes--you can Water Your Christmas Tree While You're Standing Up!
It's called "Santa's Magic Water Spout" (no comments please, folks--I don't name 'em; I just report 'em...). This American-made "Christmas Tree Watering Tube" gadget (that's what the Brookstone catalog calls it) looks like an oversized bell shaped ornament on your tree; but that hollow bell--attached by hidden Velcro straps--sits atop a three-foot long tube that runs right down to the reservoir. You pour water into the 'bell' and it fills the tree's water holder far below. There's even a built in water level indicator whose top looks like a holly berry 'floating' in the bell!"
Or go
herefor the full article.
Or
this onefor "How to Make Your Christmas Tree Last Longer
This recipe contains bleach, so be careful about getting it on a carpet or rug.
This recipe will NOT make your tree fire PROOF, but it will slow down the drying-out.
2 cups Karo Syrup
2 oz. liquid bleach
2 pinches Epsom salt
½ tsp. borax
1 tsp. chelated iron
hot water
Procedure:
Mix fireproofing materials. Fill a 2-gallon bucket with hot water to within an inch of the top and add the ingredients. Stir thoroughly.
With a saw, make a fresh cut at the base of the trunk. Cut off at least an inch.
Stand the tree in this solution for 24 hours.
Put the tree in its tree-stand and fill the well with the solution.
Keep the rest of the solution in a container to replenish the tree-stand well every day."