Take a 1:1 ratio of herbs to witch hazel (prefer to use your own infusion, or check with your local pharmacy for witch hazel made with distilled water).
Place the ingredients in an airtight jar at leave at room temperature for 2 weeks. Strain through coffee filters or muslin and bottle.
Here are some herbal combos to consider:
Lavender buds, rosemary and mint
Lavender buds, rosemary, peppermint leaves, comfrey leaves, rose petals and thyme
Peppermint, lemon verbena, sage, rosemary & comfrey