Yes and no. I do many DIY meals/recipes that are cold friendly. You have to have patience and time – most will take 20 minute to an hour. (Or more) As well, some commercial meals can be soaked (for example Packit Gourmet as a couple that work well with cold.)
But…some commercial meals DO need hot water to work right – they may have sauces that won't thicken. Or the flavor will taste off.
I wouldn't recommend using MH for this, their meals often contain a LOT of sauce. Other brands though like Backpackers Pantry and Alpine Aire do have ones that will work.
For example also, ramen and couscous can be done cold – but for best taste you need lots of flavors added.