L.F.
I highly recommend Dr. Brown's Natural Flow bottles. They are perfect for kids with reflux issues, and they make a Y-cut nipple especially for thick liquids. They also have regular nipples. You can get them from Target or Babies R Us. But BRU tends to have the best selection of nipples. You can also get the wide neck bottles where the nipple simulates the breast. Dr. Brown's saved my life with my son because he had reflux, too. My daughter did not, but I loved them so much I just kept using them!
...LF