I usually don't use starters for my dry yeast, unless I'm doing an extra strong batch. For my liquid yeast, I do liquid dilutions with cooled & boiled or distilled water. Once I calculate that the gluten concentration will result in a safe concentration then I'll use either a sorghum or brs & nutrient starter. 1 pound to 1 gallon (so usually several starter iterations of small volumes, resulting in an even lower gluten concentration). I go for some slightly outdated (discounted) yeasts when I do this though, so the starter becomes necessary for multiple reasons of low initial cell count.