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I have not used it in tea, but I cycled across the middle of Iceland a few years ago and premixed porridge oats with Nido full cream milk powder. It was basically the highlight of the day, with the caveat that it was getting pretty close to being winter, I didn't see anyone for a week and I basically spent the whole time wet and cold.
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I've used these before - they are a vision of single use plastic hell, but must be better than powder.
https://www.ebay.co.uk/itm/173022069022?hash=item2848eb411e:g:3mQAAOSwgyZcErEg&var=472347131286
I'm a tea man, but that brings in the issue of milk. Anyone use anything more fancy than skimmed milk powder? It's ok but nowhere near as good as a proper milk.