Dr. Jane Morton has a great link regarding hand expression; she's done a lot of research at Stanford about pumping getting out of hand and how hand expression can actually yield more milk. I hope it's ok to include it: http://newborns.stanford.edu/Breastfeeding/HandExpression...
That being said, you can find breast milk storage bags just about anywhere, including your local grocery store, so that stinks if you haven't been able to find them. You can always order them online from Walmart, Medela, Target, Gerber, Lansinoh, etc. Regular ziplocs, etc aren't recommended because they aren't sterile like milk storage bags. Same with bottles and anything else you can think of that you may need :)
I hope I'm not wrong here, but I think there's a misunderstanding about what you'e asking here in regards to how you should pour the milk in the bottle?? I would definitely recommend untying the bag rather than poking a hole in it. However, if you're able to get the milk storage bags, they zip and are very flexible and easy to pour the milk into the bottle.