I've been doing this for years, they will last at least a month.
Before filling.......keep bottles and product cold, then transfer and cap them smooth but quickly.
Awesome thank you for the advice! Do you use a special funnel to do the transfer or just tip the bottle on it's side and slowly pour it in?
Now i need to get the wife on board, she thinks it's "gross" but i tried to explain that when you used to return the bottles all they did was run them through a sanatizer too, and likely modern dishwashers do twice as good as the old sanatizers.