Once you break the seal on anything, you pretty much open an item up to all the
lil microscopic buggies floating about. If it's something buggies like to eat,
they'll find it and start munching.

The screw caps on milk products reduce exposure to some degree. If the
container you plan to use is sterile and has an airtight seal it MIGHT be
better than the original container but then as you pour it in the new
container it's all getting exposed and will take the buggies into its new home.

I think you are better off leaving it in the original container. If you want to
slow spoilage, keep your fridge set as cold as you can (without causing stuff
to freeze like lettuce).

*cheers*

Barb Anne