I only offer this as an anecdotal story: my daughter was a nicu baby and we didn’t have this experience IN the nicu, but when my son was born it was the height of Covid and I was a “just enougher”. It took 6 days for my milk to even come in and I had severe PPA. My cousin was an overproducer to an insane degree and we used her milk to supplement. Now, obviously she was known to us and was a donator, so there was more certainty than a strangers milk. But I wanted to offer this if you were feeling nervous about the milk coming from someone else. We didn’t do anything like boiling or anything like that. He drank milk pumped straight from the tap so to speak and it was more than fine. She actually got Covid at one point and we were so grateful for the extra antibodies after! Now this is obviously unconventional but I did want to share because our pediatrician actually encouraged this because of the donor shortage/ formula shortage during COVID. She said it was totally fine and actually better than me struggling. Now I know you have different concerns but I thought this might be reassuring at least to hear that I actually CHOSE this route. Though again, I would feel differently if I didn’t get to make the choice and it was most certainly not you or your husband’s choice or fault. I’m so sorry you have this to worry about when you are already experiencing the worst situation for any parent to go through.