We'll be bringing home our first boxer puppy in two weeks. I'm trying to prepare as much as possible in advance. The pup will be on Revolution flea/tick as that's what the breeder starts all her pups on. My plan is to never use it again...I have raw organic apple cider vinegar with the mother already. My question is if I do a 50/50 ACV-water mix (let's say 5-6 ounces of each), how many drops of essential oils can I add to the mix to help repel fleas/ticks as well as make it smell better? What kinds work best? Lavender, lemongrass, cedarwood?