I would recommend not washing your hair every day, especially since shower gels are quite drying.  There are products out there that are also multitasking and serve as a body wash/shampoo/conditioner at the same time (I know philosophy makes these). If getting a very basic and generic shampoo w/ conditioner included or a generic conditioner is not possible, then you can also use home ingredients to make a hair mask!  You can separate out an egg white and spread the mixture in your hair, let it harden, and then rinse it out with lukewarm water.  You can also use honey and banana, avocado, coconut oil, or olive oil as a hair mask and them rinse it out and wash as usual. Overall, if you eat a balanced diet and try to wash your hair every other day or every 2 days, your hair should be fine.  However, if you’d like to add more moisture to your hair after washing it, you can take a small amount of olive or coconut oil and run that through your hair.  If your hair is really fine, then that may make your hair a bit oily though.  I hope this helps, but let me know if you have more questions!

-Christine