First, make an infusion of the herbs in water, like you are making a tea to drink. Measure the herbs by weight to get a more accurate measurement. Since this is a washout product, you could also measure by using ½ cup of chamomile flowers and 2 Tablespoons dried rosemary leaves.
Pour the boiling water over the herbs and allow to infuse for 20 minutes or so, depending on how much time you need to finish that cup of coffee, start another load of clothes and get breakfast going for your kids.
Pour the herbs into a cloth over a strainer and gently squeeze to get all the water out. You will have just over a cup of tea to use. You only need one cup, so any "excess" can be enjoyed while you are waiting your teenagers to get out of the bathroom. For me, that's a 2 cup ordeal but I digress.
Carefully stir in the oil and honey. You will need to shake this up each time you use it to redistribute them into the infused water. Store in a plastic container. Broken glass in the shower is not a pleasant thing, trust me on this one.
Recipe by Scratch Mommy at https://scratchmommy.com/diy-conditioner/