Antibiotics you add to the drinking water.

Terramycin Powder "Oxytetracycline HCI" A broad-spectrum Antibiotic
It is a Soluble Powder. Add 3/4 teaspoon per gallon.
DUMP AND MAKE FRESH EVERYDAY.
THATS MY SILKIE DIRECTIONS
A larger breed can have 1 Teaspoon mixed in for every gallon of water.
Do Not eat the eggs from sick birds you are treating.
Read and follow the directions on any products you buy.