Yes, you can put it in her formula. But I would try making a separate bottle and adding her dose to about 1 ounce of formula or so. Hailey did not like the taste either and she used to gag. Apparently, this is one of the drawbacks of compounds- the salt can trigger a gag reflex. But you have to weigh all the pros and cons. I wouldn’t add it to her whole bottle b/c if she doesn’t like the taste, then she might not take the whole bottle. I have to say that even when we added it to an ounce of formula, she still never took it easily, but Hailey had a feeding aversion.
About the JR kits, the amount of time you go through them will depend on your dose and the concentration. If I remember correctly, you’re doing 40mg a day at 4mg/ml, so it seems right that it would only last that long. We did 30mg/day and ours lasted 10-12 days if I didn’t waste too much on the outside of the syringe. Good luck. I’m glad to hear that the caracream is working… now to get it into her!