hi M.;
i would suggest that you go to your local La Leche League Intl. chapter for information on infant nutrition but i can tell you this from experience w two exclusively breastfed children.
your 7 month old does not need to take a bottle! hurray! your life just got easier.
at 7 m your daughter can have pretty much whatever food she can handle or wants. she can have all kinds of fruits, veggies, meats, and she can probably easily learn, with some practice, to use a straw cup or sippy cup and have water in that. my children never had one drop of formula and they never took a bottle and i never even pureed food or used baby food. if they could hold it and suck it and gum it, they could eat it.
as long as you nurse her plenty in the morning before you go and as often as she asks when you get home, that will be plenty of breast milk for her. juicy fruits like watermelon or cantaloupe will keep her hydrated and are yummy! avocado is soft and filling, sweet potato, mashed potatoes with hummus mixed in, soft bread or chewey bread, a bagel can keep a 7 month old busy for 20 minutes. chicken that's been roasted till it's very very soft is great, noodles, there's a lot. i gave my kids some yogurt at that age and they loved it and had no problems with it.
i would urge you to stay away from the bottle. if she doesn't want it, there is no reason to force it. if she likes it, you're in trouble with the nursing. breastmilk is BY FAR the best nutrition for her and she will get all she needs if you give it to her when she requests it; it is not possible to spoil her with nursing. and when you go back to work, she may miss you a LOT and wake up at night to nurse and be close to you. though you will be tired, you should try your best to give her as much night nursing as possible. the more you give in the smoother the transition will go.
good luck to you and congratulations on your successful nursing relationship with your wonderful baby!
J.