I agree with
@SolarDuck, just cut stuff up small enough and try to remove dangers from their environment. I have 5 acres of huge slugs that hide - so unless I keep my ducks inside and deny them a natural-ish life it is something that I choose to accept.
I ended up calling my vet about the slug my duck was choking on. They pulled her from an exam room and I asked her what to do. She told me to just offer water and do nothing else. My poor duck was so delerious from lack of oxygen at that point that she couldn't find that water bucket I put right in front of her. So I put her in a shallow pool of water, but then she was falling over. It was horrible. I was sure she was going to die. Suddenly she swallowed, drank some water, and started walking around. And I went and cried.
I also remember another tip for a new duck owner. After your hypothetical ducks are fully feathered and outside most people recommend not giving them food and water at night. They make such a mess. You'll save yourself a lot of work by leaving their water outside only, since they'll splash their water all over their bedding and you'll need to clean their wet bedding out daily so it doesn't get moldy. And of course, since you can't feed them if they don't have access to water you would then have to take up the food, too.