I use couscous for summer backpacking. I don't find a great deal of difference from one brand to another. Obviously you get the best results with hot or boiling water. Cold hydration is very hit-or-miss. It may work, but you may not like the result.
What one friend does is this. Get a plastic peanut butter jar with a wide mouth. In the morning at breakfast, you throw in your portion of couscous and whatever hot or warm water you have left. The exact amount is not too important. Seal up the jar and carry it around with you all day. When arriving in camp in the evening, you check on it and maybe add cold water if it doesn't look right. Then at mealtime, you add in some olive oil, salt, and whatever flavorings.
I've done this, but I find it much easier to deal with air dehydrated cooked quinoa. It does nicely with cold rehydration.