If it is the water in your apartment, try washing with distilled water. You can get gallons of it at Walmart for 99 cents. In college, a girl used to do this - she washed her hair in the sink with purchased water, rather than using the shower water.
High Density, High Porosity, Medium Texture, 3B with some kink

Lo-Poo: No Preference
Co-wash: CJ Smoothing Conditioner
RO: CJ Strengthening Conditioner - HG
LI: CK Satin Roots
Styler: CK Coil Jam
Other Likes: Castor Oil; CK Twist Whip, MD CSC
Dislikes: Wheat Protein; Aloe LIs or Stylers