Sourdough experiment continues

I have been feeding my starter for a couple of weeks and reading websites on the subject. I have discovered that it takes about 3 weeks to really develope a good starter feeding it twice a day. I have to make a trip to care for my mom after her knee surgery so I won't be around to baby my current starter. I will try and bake bread with it one more time before I leave just to see if the bread has a less bitter flavor since I stopped feeding it with rye (which may have been rancid to start hence the bitter flavor) and started feeding it with unbleached, white, all-purpose flour.
I have read on several websites that a growing starter needs to be feed twice a day for 3 weeks. Each feeding consists of 1/4 c water and 3/8ths cup of wheat flour, then add about a cup of the growing starter discarding the remainder. I cover mine with cheese cloth but one web site used plastic wrap. Check out this website, I really liked it. It is gnowfglins.com. It is a teaching website and asks people who use it to pay what they can afford to send. I think it is worth using. The site has excellent videos demonstrating the process of starting a starter.