The weather is starting to warm up a bit soo depending on how you use your GC could result in more coolant being used, I wouldn't worry too much about it because as long as there isn't a leak in the system or there is no trace of coolant under the car (on the ground) you should be ok.
You sometimes do get this type of smell from new vehicles.. You said there was still coolant in the reservoir, soo I dnt think it was over heating, otherwise it would have been totally empty, and sometimes smoke...
Your best bet is to try Halfords, they have a complete list of coolant specific to your vehicle. They open on Sunday from about 10am, and they're everywhere so you should have one near you, coolant colour doesn't really matter tbh, but if you want pink then look in store for a pink colour one..
After topping it up, just keep an eye on it, checking it after you've used the car, maybe 100-200 miles, if it still uses the coolant at a rapid pace, book it in and let your local Jeep dealer check it out for you..
Hope this helps!!