<< I drink about 1.5-2litres in one training session that is about 2hrs >>
A weight lifting session that lasts longer than 1 hour is certainly counterproductive... don't do that, just do it hard, intense and in 45 mins.... that is, if you are not on the 'roids, then go ahead...
Vitamin C is a great supplement, but eating fruit and veggies ain't gonna cut it, you need way more than that, i recommend 1-5 grams a day, taking in smaller dosages throughout the day, yup, get the pill... Vitamin C will not only reduce the muscle eating cortisol, it is also a collagen anabolic which will take care of your joints, but not at small dosages...
I recommend that you combine it with NAC and HMB, NAC is (N-Acetyl L-Cysteine) a common antioxidant, and chicken is the primary food source... ever wonder why chicken soup is recommended when you are sick? Now you know why...
HMB is a cortisol inhibitor, it reduces cortisol through the usual pathways but still let's cortisol pass to nerve endings...
Patrick