where to get freshly squeezed lemon juice?
There's a juice place in the basement level of St. Lawrence Market. Check with them.
If you end up doing it yourself, this may sound like an obvious thing, but I've been squeezing citrus for ages by hand and I recently just bought myself one of those little plastic things that you squeeze the lemon/lime half over. This little $2 gadget makes a HUGE difference - easier and you don't waste anything.