I've been there during Ramadan.
On board Qatar alcohol is a yes, but it's not displayed.
In the Qatar air-side lounges at Doha airport I believe it's now also a yes from a year ago. It was for sure was a no when I was there. But all food and other beverages were available. If departing, you could buy alcohol duty free, via the airport DF store's curtained off entrance door with all windows obscured.
You cannot take alcohol into Qatar.
In the hotels, there's a different offering. Those that have club lounges and bars do not serve alcohol during Ramadan. The bars are likely closed entirely. Even my in-room minibar had it removed but the price list was still there.
Eating during the daytime is allowed in hotel restaurants (you might have to be a registered guest?) but under almost camouflaged conditions. Again a curtained off entrance door with all windows from the restaurant obscured.
It's interesting in Doha during the day. Restaurants, cafes except in the major hotels all closed. At night it's a very different story!
And you can go to the supermarkets during the day. Just don't consume any purchases in public during the fasting hours.