As Sylvan stated, we do plan to make a change to the way the alchemy created flasks work so that their effects persist for the full duration of time, regardless of whether or not a character dies while under its influence. This should make it more desirable for players to gather the ingredients necessary to produce various flasks for both themselves and others

At this time it's not possible to move characters from one account to another. If such a service does ever become available we'll make it known on the main page of our website - www.worldofwarcraft.com. I know a few people that have had a similar problem and my advice to them was to make new character to level when they wish to play together, and continue with their current characters when they wish to play apart.