This is fine. Babies will still be more interested in breast milk than solid foods. Try to introduce different semi solids at different times of the days. Fruits, veggies, oats are all the different things that should be tried.

At 7 months your child will also be on semi solid foods as well. Try to give milk mixed with some fruits or oats. Keep introducing the bottle every hour or so. When your baby is hungry he will accept. Babies go through different phases at different times during their first year. Keep trying.

Hi give juices or soups or any watery form if baby is taking that then baby is well hydrated

Hi if your baby is passing urine 6-8 times a day then baby is getting enough feed don't worry

My baby also not drinking with bottle, he start to play with it so i generally prefer spoon bowl.
Atleast his tummy is full. In starting he deny for spoon bowl but after few days he enjoy it.

If he doesn't take bottle feed,give with some different sippy cups,glasses...

And give weight gain foods like potatoes,sweet potatoes,ragi, pumpkin,dairy products,dry fruits powder, Banana...

Give healthy homemade foods...
You can check on Google as mylittlemoppet or gkfooddiary,it has many healthy recipes and weight gain foods too... have a look...

If you want to bottle feed your baby it should be introduced at 40th day of birth. Also, you can try now too but it will take a little time. Use feeding bottle instead of normal bottle
Try the one from Chicco or Philips avent

You can continue bm till one year along with foods...

Hi is your baby teething or having cold and cough?

Hi can you send image of it?