If your parakeet has decided to be on bottom of cage it may be nearing time to go. I raise several varieties of birds and in my observations when they go to the bottom they are preparing for death. I pray not but it signals they no longer have the strength to perch any longer. Electrolyte will...
I have birds too. Here is what I myself would do.
1- rule out raw cut oatmeal being fed or any other type of dry food that will absorb liquids in digestive system or crop.
2- make up 1 gallon of electrolyte as you would for chickens - 1 little pack to one gallon of water into spring water...