KBV can be tricky to order from. It is one man and his wife doing it. They don't trust others to take the same care in mixing that they do. The store is currently open on Tuesdays and Fridays, but if you need you can pm
boB.
As far as steeping, basically you just sit it up for a while. Flavors saturate more and can alter the overall flavor with time. Some flavors will only change a little bit, but some flavors will change quite radically. There are several tricks to steep faster that you will find on this site. Some say to run hot water over the bottle, others say to leave the cap off overnight. Myself, I buy bottles I know need steeping in advance, and just put the bottles in a drawer.