I shouldn't worry about the mold. I've had that with spoons where I've put them in a plastic bag intending to finish them off the next day then found them a few weeks later! There's nothing that you could get from the wood that would cause you any harm.
Next you need to leave it to dry properly and dry without splitting. The time this will take will depend on the wall thickness, but I'd say maybe a couple of weeks. To start with leave it somewhere fairly cool like your garage or unheated bedroom, then it can sit somewhere warmer, but still not in direct heat. If it drys slowly it'll be far less likely to crack.
Once its dry you can oil it. You'll find all sorts of advice on here about different oils different people use, so I'll not repeat it all, just make sure what you use is food quality. If you warm up the oil by sticking the bottle in a jug of hot water first it'll become thinner and penetrate the wood better. Give it a good coating, let it sink in then wipe off the excess.
Then post a picture for us!
Nicola
