E.S.
Hi Rona,
Please don't feel guilty about the feeding. I didn't make much milk either (I was working and definitely wasn't eating enough and staying properly hydrated... and I didn't always have time to pump at work) and eventually had to start supplementing. In the end, it was much easier to wean off at a year without my breasts getting engorged and uncomfortable. If you really still want to try solely breastfeeding, I think the best thing would be to get your milk supply back up like you were saying by:
1.) Drinking lots and lots of water and making sure you're getting enough calories during the day.
2.) Pump whenever you can, perhaps after you've tried breastfeeding or sometime between feedings and always when he skips off of you and uses a bottle. If you pump for more than 15-20 minutes in one sitting it will usually stimulate more let-down (only if you're properly hydrated). Just try not to overdo the pumping and get engorged!
3.) Once you feel your milk supply is back up and/or you've stored enough breastmilk, you can try stopping the formula and supplement the bottle feeding with only breastmilk. Then if he's still refusing eating off of you, try cutting out the bottle completely (if you're able) until he's more receptive.
4.) You may also want to try going back to newborn flow nipples on his bottles so that he has to practice sucking harder again. He may have just decided he doesn't want to work as hard to get his food and that's why you're having trouble with him eating off of you.
If you try and it still doesn't work, just know that formula was invented for a reason and your son will thrive on that as well!
Also, I don't know if this is what's happening with your son at all, but my son did something really similar for about a week when his front teeth were starting to come through (he was just about 6 months old). He wouldn't take a bottle or me except at night when he was tired and hungry and wasn't as particular. We just kept trying and he finally went back to eating just fine.
Good luck! You're doing a great job and your son will be fine either way!
E.