Building supply of milk?

H

Hello! I exclusively breastfeed my two week old, I'm also a first time mom so this is all new to me! It seems like in just the last few days my milk supply has decreased, especially on one side. My breasts are noticeably smaller and it's much harder to hand express. My breasts also soften much faster when my daughter nurses, and she is ready for the other side after less than 10 mins. She is gaining weight very quickly (12oz in the last week!) and has frequent wet & dirty diapers - so I know she is getting enough. But I will need to start storing milk as I go back to work in 10 weeks. Anyone have a system that has worked well for them? My daughter nurses about every two hours during the day and 3-4 at night. Is there any way to stock pile milk without constantly being either nursing or pumping??