There are several natural conditioners you can try.
Boiled nettles make an excellent strengthening rinse.
Catnip (my personal favorite) creates a beautiful shine while it conditions. Steep catnip leaves and blossoms in hot water. Keep container covered until you're ready to use it. The oils dissipate with the steam, so make sure the cup is covered with a nonporous lid.
Olive oil, grape seed oil even cooking lard works. The oils take a bit of work to get out though.
Here is an effective method for a banana hair mask. https://hubpages.com/style/Natural-Banana-Conditio...
The banana smells wonderful and makes your hair very soft. Mine wasn't "shiny" like store-bought garbage but, it felt and looked wonderful!
Hope you find a recipe that works well for you!