My son will be 7 month old on this Friday and I also planning to give him congee. He is now having rice cereal twice daily and he like the one from Nestle very much. He need more than 3 tablespoon rice cereal mixed with 1/4 pear or apple. He just have 3 Tbsp rice cereal mixed with pear and 3 oz milk.
For the meat, I have heard that you have to start with white meat first, i.e. chicken/pork/fish and then red meat the last, i.e. beef/lamb. You can prepare the meat for one week use. First, you cook the meat with water and blend it very fine. Put in the container for making ice cube and frozen. Just need to take one cube each time for the meal. Vegetable can also use the same method. Remember that if you cook carrot, spinach, turnip & beet, you need to pour out the water you cook with and add other clean water to mix with the vegetable since it have bad influence for absorbing oxgen inside their body for babies. You can start red/yellow vegetable first then green one, for example, carrot, pumpkin and sweet potato. Also, no cabbage, califlower and sweetcorn for baby before one year old. You can also prepare egg yolk to mix with congee for baby.
I also have hear the man from fish stall said that if you want to keep the fish better and longer, just put it into the freezer directly after you bought without cleaning it. Just make it clean when you going to have it. I use this method and find that it work since I like you just go to the market once a week!
Hope the above info can help.