Having meals that need no heat has been very popular in the past couple years. The recipes can make great lunches, an easy meal in bad weather and also they have been extremely popular with long distance hikers looking to save weight on fuel.
No cook lentils and fish:

No Cook Method:
Pack your meals at home in a snack, sandwich or pint/quart freezer bag (whatever you prefer). Note the amount of water on the bag in permanent marker and what the meal is or tuck a small note inside.
Depending on the recipe rehydration will be nearly instant to up to 30 minutes. Add in cool water, seal the bag and knead or shake gently. Set aside till ready.
For great recipes that require no cook see here and here.
Simple eating on a cold day:

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