I would never use a bottle all day. I imagine that it must smell rotten, milk finds a way in all the nooks and crannies. I have had to re-use a bottle before but fully washed it in super hot water before reusing. I've haven't seen a bottle just be refilled like that before. Maybe they are assuming you will have to be hand washing in between?
Married to my love
, SAHM to Dylan my T1 diabetic (8/03)
, Bobby (4/10)
, and Lily (6/12)
Homeschooling, Catholic, slightly paranoid mama