How to transport coffee I'm afraid this is a dirty instant coffee question.

Every morning I'm up pretty early and will usually make myself a quick instant coffee in a travel mug and hit the road. It is really good instant coffee, IMHO, and not only keeps me going for most of the morning but is also very tasty. But usually just after lunch I'm hankering for another, and herein the problem lies: most of the office are tea drinkers, and the options for coffee are limited to one awful instant variety.

It wouldn't really be acceptable for me to bring in a jar of coffee (I know this would be fine in some places but I wouldn't feel comfortable with it in my workplace culture) so what I'd like to do is bring in a mix of my coffee contents to use in a one-off way. I take my coffee with two spoons instant coffee, three spoons sugar and about 40ml milk or so (it's quite a big mug), and would love a way to transport this concoction to the office daily.

Ideally I would create a little sachet with all the ingredients inside but that doesn't seem like something I'd be able to do. I've also considered bringing it in in a tupperware or some other airtight container, but I think I'd struggle to transfer it all properly from the container to the mug.

Does anyone have any coffee transporting solutions where I could somehow bring in all the ingredients I need, mess free, in my backpack?
Actually, I will change the direction to ground coffee. A few months ago, I have seen a nice solution for campers. I took a photo of it for reference at that time. It seems quite useful to me. However, I mostly prepare my 'tasty' coffee at home and drink 'crap' coffee in the office. So it didn't fit me.

Still, here is the invention. A camping style brewer pack. You will need just the hot water in the office. Each pack is single use only. It was just a bit more than regular price. But it was still affordable. Still, you may not like to use this in daily routine.