Re: Questions for those who DO NOT use bottles.....
Your supply will adjust to your baby. Nursing encourages milk supply in ways that pumping simply can't. Most babies nurse more when they are sick. Nursing strikes are rare (for breast only babies), and at this point, when they do happen, you can pump and offer in a sippy cup. And, if you must supplement, you can always use an SNS. Doing so will help build your supply and keep your LO practicing nursing at the breast.
As a SAHM I have never had a nursing strike (I have 2 lo's, the oldest nursed until 3+, the second is nursing through my pregnancy at 16 months). My girls have had 3 total bottles in their entire lives. All 3 times, I was at the doctor's office and DH offered it. They drank a little, but were glad to be back with mom. I hate pumping (the effort compared to nursing is too great) and am glad to just offer all day long.