My LO just started day care at our company site. I can (and plan to) nurse him when I can, but they still ask that I pack enough prepared bottles that if I'm unable to make it all day that they'll be fine. This means I have 3 bottles coming to and from day care each day, when LO will probably just eat 1 a day. I had been storing my breast milk using the Avent sealing discs on my bottles so they were nice and air tight, but then I put nipples and caps on all of them for daycare. I'm wondering what I should be doing with the bottles that are left over. Should I put the sealing discs back on for overnight at home and then put nipples back in the morning or is it okay to store them for several days with the nipples and caps on?