Even though you feel you might not need a second liter, there can be accidents with the stuff you keep (folks do occasionally drop things, and if it's a glass bottle it will likely break). If you do lose some of your initial liter to some event, having the second gives you a buffer to replace that loss. Obviously do whatever you're most comfortable with, but I wouldn't use the probability of never getting to the second liter as reason enough to sell/donate it.
Dang FDA! If I thought I could buy more down the road I'd just buy it by the 500ml bottle and replace as needed. It's in the original HDPE plastic bottle. I understand glass is better, but subject to accidental breakage.
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