Xtol stored in full glass bottles (I use 5 1-liter brown Boston rounds from SKS) last at least 6 months or even a year
Check beer and wine making shops. There's a place, just down the street from me called "Bierhaus International." I get clear glass jugs really cheap. $5 for a gallon jug. The last time I went there, the guy behind the counter said, "Oh, yeah! You're that crazy guy who still uses film!"
My darkroom is actually dark unless I'm in there with the lights turned on. Amber or clear doesn't make any difference for me.