Here's the alternatives, te Judy.

Flour = Almond or Coconut Flour
Fresh milk = Almond Milk
Sugar = Equal Gold, Stevia or Monk Fruit
Oil = Olive Oil or VCO
Milk powder = Use Coconut Flour as flour instead, it could be a substitute kay medyo same taste lang.
Condensed milk = should be unsweetened, just add Stevia or equal gold nalang for its sweetness.
Hershey's syrup = Use Ricoa Unsweetened Chocolate Bar and melt it to create your own choco fudge, just Stevia or Equal Gold
Choco Powder = Ricoa Unsweetened Cocoa.

The rest that I didn't mentioned na ingredient is pasok ra sa keto.

Enjoy the substitutes ate and your experiment. 😄