You won't get a fragrance or essential oil to really mix with the water without a solubilizer like Polysorbate.
You can try a 50:50 mix of water and vodka (80 proof) and see how that works for you. Add your EOs or FOs to the water-vodka mix. Use with a fine-mist atomizer pump.
I add about 5% fragrance for a room air spray. That translates roughly to 90 drops of fragrance in a mix of 3 TBL water and 3 TBL vodka. Shake very well before use and while you spray.
Avoid spraying on or near pets, especially cats, birds, and other small critters. Avoid spraying on painted or varnished surfaces -- the alcohol or the fragrance can damage the finish.