Yes they do, they’re called “kaffibaunir” or just “baunir”

No I'm afraid alcohol can only be bought in government ran alcohol shops. My advise is to buy what you need in duty free when you land (it's near baggage collection).

we never had that issue

No problem when we used ours in Bonus

Again, we did not visit many Bonuses. However, the one we did visit, although not particularly large, had a wide variety of foods. It was very close to the downtown area. I did read on Grapevine, however, that It was closing. I guess my advice is to check the Bonus website. With the cost of eating out, buying food at Bonus, or another grocery store, and having some meals in your room/condo, is a great idea. We also did that.

Yes, they do, but I read that it was less alcohol percentage than from Vinbudin, or at a bar.

No. Markets do not carry alcoholic beverages.

I used my Visa card to pay for my groceries, they have the card reader, so I imagine they would take all cards.

We went to various bonus stores and each one had parking available with no time limit posted. Many were in a plaza with at least one other store and had plenty of available parking.