Donating good quality food for strays is imperative. These animals are usually weak, ill or underfed. 
Your food may be the only thing that keeps them alive until they are rescued and adopted. 
Good quality food can be any of the following preferred brands: Meals for Mutts, SavourLife, Hill’s, BlackHawk, Royal Canin, Fancy Feast, Sardines in spring water.
Food specific for animals with allergies, kidney/renal friendly or diabetes, puppy and kitten milk is highly sought after and can save lives.