Because my husband is allergic to smoke, I tend to use smudge spray inside my home. I've tried a few recipes but this one is my favorite:
1 oz (30ml) dark brown or blue glass bottle
3/4 oz filtered water
1/4 oz alcohol
8 drops sage essential oil
pinch Epsom or sea salt
In place of filtered water I like to use melted snow or rainwater. For alcohol I use a homemade vanilla which consists of 2 cups of vodka and 2 vanilla bean pods which steep in a dark cupboard for several months but you could also use any alcohol and add drops of vanilla or lavender essential oils if preferred.
I like to smudge my studio before I start work for the day and this scent makes me feel especially happy and calm. And because the sense of smell is one of our strongest senses, I believe beginning this way flips my brain into creative mode rather quickly. It's a good way to begin my day.