What have you been feeding your fid lately? Also, any juice (or other 'non-water' beverage?). Fruits and veggies can alter the color of droppings as well as its consistency. For example, if your fid eats a lot of strawberries, then having watery droppings that are red in color is totally normal.
Just like us humans, what we eat and drink directly affects the color and consistency of our poops, same is true for birds.
If there has been no change in diet and the droppings have been like this for several days then I would schedule a vet visit. Even if your fid is eating, drinking and behaving normally, there could still be an underlying issue- birds are masters of disguise. You don't want to wait til you see signs of illness, as then it can often be too late.
Good luck and keep us posted!
Side note, I could not load the linked page, so my advice is my own.