What are you feeding your birds? At 4 weeks old they are not yet weaned and will not eat solid food on their own, as if they were in the wild they would be still fed liquids by their mother. If you are feeding them solid food, like seeds or veggies and fruits and giving them water to drink, and are putting both the solid food and water in dishes for them, they are not eating or drinking and are dying!
A breeder would be hand-feeding a 4 week old baby parrot with a pipette, eye dropper, or plastic syringe at least 6 times a day, and would be hand-feeding them baby bird formula which they have to mix up with water, from the powder it comes in, and there is a lot that goes into this. It must be fed at 105-110 degrees Fahrenheit, any hotter will burn their crops, any colder can cause them to get very sick...This is awful, the breeder sold you 4 week old baby parrots and told you none of this?
Also, a 4 week old baby parrot has no feathers yet, only pin feathers, so they can't regulate their body temperatures, nor can they properly digest any formula or food if they are too cold. This is why they must be in a brooder...
Can you ease post a photo of them? And please tell us what you are feeding them and how often? This is very concerning, you've only had them for 4-5 days, but they will not live much longer with no formula, they are dying of dehydration and starvation! This is why they are very sick! Watery droppings is not okay, it's very, very bad!
"Dance like nobody's watching..."