Garnier Fructis Damage Eraser Reconstructing Butter
I was actually impressed when I tried this out. I tried out the leave in restore treatment of this line too, and like it a lot. This adds moisture to my hair without making it too oily. I also find that it really fights the frizz on a humid day. The other great thing is that it's very affordable for 8.5 oz, and can be picked up almost anywhere. If you like it enough, they have a whole line of this product!
It's a 10 Miracle Hair Mask
I don't think I have ever heard a bad review about this stuff. It definitely puts moisture back into my hair, and I have used the leave in version of this as well. It makes my hair shiny and soft! The downside to this product is that it is more expensive for 8 oz. This mask can sometimes leave my hair a little greasy when I am trying to style my second day and third day hair.
Overall, if I could only use one product, I would pick the Garnier Fructis! It lets me have second and third day hair, and gives my hair moisture without making it too greasy. Check this product out if you are looking for a great deep conditioner!