I use a heated 5gal bucket and yes I do indeed pour the water directly into the bucket. I do think my ducks would create one heck of a mess in short order with a dog bowl, thus the reason why I use a bucket and not a bowl.
If you are concerned that your ducks are not tall enough to get up to the lip of a 5gal bucket, you still have options. You could a) Get a 2.5gal bucket (which is exactly what I would do if I had 6-8 ducks) or b), You can build a simple pallet water bucket patio, which is what I do here. In the spring, I'll drag the pallet patio out, and then replace it in the Fall. What you do is trace around your bucket to get the idea of how much to cut out. I used a sawzall but it is simple and would be easy to do by hand saw too. So you cut out your hole for the bucket, the bucket drops down into that space of the interior of the pallet, and the birds are raised up and it works perfectly perfectly!
Word of caution tho, the board with the brick needs to be there to prevent full-on swimming and getting in the bucket. I did have one adult drowning last year before I did this.
If you are concerned that your ducks are not tall enough to get up to the lip of a 5gal bucket, you still have options. You could a) Get a 2.5gal bucket (which is exactly what I would do if I had 6-8 ducks) or b), You can build a simple pallet water bucket patio, which is what I do here. In the spring, I'll drag the pallet patio out, and then replace it in the Fall. What you do is trace around your bucket to get the idea of how much to cut out. I used a sawzall but it is simple and would be easy to do by hand saw too. So you cut out your hole for the bucket, the bucket drops down into that space of the interior of the pallet, and the birds are raised up and it works perfectly perfectly!
Word of caution tho, the board with the brick needs to be there to prevent full-on swimming and getting in the bucket. I did have one adult drowning last year before I did this.