At 8 months you are fine trying different kinds of cups instead of a bottle for the milk. Try some sippy cups, straw cups, the 360 cup, etc. Baby does still need breastmilk or formula, but the method of delivery is up to you (or up to baby).
Is your baby on purees or BLW? I started with purees and used this book for inspo, but it also has some recipes later on that are not just purees. At 8 months we had started to introduce finger foods. Lots of cooked and small-cut veggies, mostly.
A friend gave me a book of recipes that goes up to 12+ months, the first one I used with meat was a chicken(4oz) + sweet potato(medium) + apple dish. Chunk everything up, saute 1/4 cup of chopped onions in 1tbsp of butter first until they get see-through, toss the chicken in the onions until the outside is all cooked, dump the sweet potato and apple chunks in the pan, add a cup of chicken broth (or just water), raise to boil then lower to simmer for 15 minutes.
This one is cool because you can blast it with a food processor to be more or less puree-ish over time. Currently I don't make it as fully puree anymore and my kid (9mo) can chew on little chicken bits.
Also assuming you have introduced various veggies you can just make stews with them plus whatever meat. Today I made a beef stew with potatos, carrots, onions and beef in the slow cooker. If she was still littler I would pulverize it in the food processor but since she is good at handfeeding herself and the veggies are soft, I will just make pieces smaller by hand when I feed her, and pull the beef chunks into strings.
Edit: This is the book.
Yup! Steam or boil foods individually, puree in food processor, spoon into fresh baby ice cube trays. once frozen, pop out and move into quart sized ziplock freezer bags labeled with what the food is and when it was frozen. I've read they're good for up to 3 months, but we've never had any last that long anyway. Then we mix and match them at meal times, rather than making several-ingredient 'recipes' and freezing them. With fruits, we'll sometimes melt the cubes and mix them with whole milk yogurt or his baby oatmeal in the morning. Make sure you buy organic whenever possible - especially with the dirty dozens. It can be time-consuming, but I really enjoy it! I guess it's replaced all the recreational baking and cooking I did pre-baby.
I got this book at my shower and I've found it very helpful so far! http://www.amazon.com/Top-Baby-Purees-Annabel-Karmel/dp/0743289579
Our son is 7.5 months old and doesn't have any teeth yet, so I'm assuming we'll be doing this for a while.
We started with this book.
But you'll want to start with single-ingredient purees and then do blends later. My baby loved sweet potato and would eat almost anything that was blended with sweet potato. For fruits, banana is great to blend with for the creamier texture.
We also got this baby food maker that meant all we had to do was pretty much chop things and put them in.