By "these few days" do you mean he was just recently adopted or are you dogsitting for someone?
Necessary supplies for a golden retriever include a comb (large Furminator is the best) claw clippers, dog shampoo, a breakaway leash, an ID tag, an adjustable collar (not the shock kind), a slow feeder food bowl, two big steel dog bowls, Frontline Plus for dogs, poop bags, and a scooper to clean up after it along with various dog toys and high quality wet dog foods. Have you purchased any of those yet?
There are many slow feeder styles, but unfortunately none of the steel bowls are mazes like this one.
In case you are wondering, bloat is a life-threatening emergency and can't be treated without invasive surgery. A slow feeder can save your dog's life because bloat affects dogs the size of golden retrievers.