At the moment only about 3l (I have more but that's got some oil in as well, and I guess you won't want that).
I expect I'll have another 205l drum of Meth for biodiesel production in a couple of weeks. Each batch (I make 80l of fuel at a time) leaves me with about 3-5l of Meth/water distillate (the water will be pure water too, not just tap water, since it's been distilled off with the Meth @ 80C).
I was going to try and find a way to burn the distillate off (IE spirit stove) just to get rid of it, but if you'd like me to keep it by you'd be welcome to it, since it'd save me the hassle of disposal.
What sort of quantities do you use?
BTW, I called the Anglo American Oil place to see how much they charge for 205l drums of Meth - they wanted £319 which is quite outrageous - so I hate to think how much you've been paying for it.