Army training 101
Never set up a camp or covert base during daylight hours if you can help it. It exposes you to overhead collection and draws attention to your location.
Fires are for wimps, an MRE heater in the bottom of your sleeping bag provide plenty of warmth.
Don't use a tent if you can help it, thats why we don't issue shelter halves anymore. Bivy sacks are the way to go.
besides the less you have to carry with you the lighter you are. sustainability is the key not supplies. Instead of large amounts of water, carry iodine tablets or a water filter. This is what keeps you alive in the field, inevitably supply is going to get lost (see PVT Lynch), and you are going to be left without for a period of time. Just my .02 dinar