@kpost2 Do you also have MAC, and are you being treated with antibiotics? If so, you need to avoid alcoholic beverages because the antibiotics are very hard on liver and kidneys, and alcohol just adds to the load.
Are you suffering weight loss as the result of bronchiectasis and/or MAC? You need to be especially alert to maintain adequate calorie intake, especially a good amount of protein, as it helps maintain & repair tissue.
Also, many with bronchiectasis have GERD (reflux), either with symptoms or without (aka "silent GERD".) If you are among them, you should be following GERD precautions to avoid gastric fluids getting into your lungs, causing more damage. Search for "GERD Diet" or "GERD precautions" and look at sites ending in .edu or .org for the best research-based information. Avoid paying attention to sites trying to sell you anything, whether it is supplements, special food, or "secrets..."
Other than that, avoid foods that make you feel worse. If you decide to eliminate dairy, be sure you use adequate calcium supplements. There is also some evidence that bronchiectasis is associated with low Vitamin D levels, bronchiectasisnewstoday.com/bronchiectasis-experimental-treatments/vitamin-d/. Maybe talk to your pulmonologist about Vitamin D-3 testing & supplementation.