Title says it all.
Depends on climate I'd imagine. Nicotine doesn't react well to heat. Mixes will also generally change and concentrates may not hold up as long. Pg and vg should be fine.
For the winter is okay?
You are living in your car in the winter? Maybe you need to think about shifting your priorities to getting a roof over your head and a warm bed, instead of worrying about your juice. But then again I don't know your situation.
If possible keep your flavorings and nic in a box or something to keep them from getting sunlight. I can't think of any reason why you couldn't mix in a car though. Might be a little cramped but as long as you can measure/weigh and get everything in the bottle then you're good to go. Alternatively, if you're anywhere near Mass, you are welcome to use my mixing station. Slim chances you are but figured I'd offer. Sorry to hear about your situation, hoping you can get an apartment or couch to crash on soon! Also anyone that gave you shit in here can get fucked, sideways.
As long as you can still keep the juice cool and dark you should be fine. If it's cold and you're mixing you may have trouble getting the mixture to properly mix
I can probably just put the juice in my pocket and walk with it to get it to mix yeah? Or just boil some water?
Are you near nyc?
Maybe if you keep the Nic in a little cooler in the trunk just to keep the sun off of it.. I think that would be your best bet. Best of luck..
They should be okay. Depends on weather really. They might not keep as well or as long if its hot. Dont buy to many supplies at once so you can keep everything fresh. (Buy small bottles) Hope you have better luck with your situation soon.