I also have a 6 month old and I just weaned her from the breast but I try to feed once she wakes up then her play time is happy and contented. Sometimes you don't sleep so good when your tummy is full. I also do this deliberately cause I don't want her to be in the habit of falling asleep on the bottle. I want her to be able to fall asleep on her own. So... I might recommend that you nurse her first prepare her food and feed her with in 15 mins. Cause like you said she will snack all day plus you will be spending your day feeding your child.
Until one year old, breast milk/formula is the main source of nutrients. So load her up on milk then top her off with baby food. Also, at 6 months old they should be on the same eating schedule as the rest of the family (breakfast/luch/dinner)
A great book on making baby food and feeding schedules is SUPER BABY FOOD, by Ruth Yaren. I hightly recommend it! It is loaded with good info!
And enjoy every moment - as you have already seen - they grow so fast!