Elizabeth, let me start from the bottom of your post and move up.
You should never go hiking/backpacking, even on remote day trips without the Hiking Essentials
Also some kind of fire starter like a Light My Fire Swedish FireSteel Mini , or Storm Proof Matches as part of that kit.
Read through the Essentials stuff and then study up on it.
For those who don’t want to go elsewhere to read:
Mountaineering: The Freedom of the Hills, 7th edition, © 2003 by The Mountaineers now lists the TEN ESSENTIAL SYSTEMS:
(this has not been edited for BPL types)
1. Navigation
Added to the obligatory map of the area and the base plate compass must be the ability to use them. This requires training, study, and practice. Navigating with a map alone is also a necessary skill. Attach a whistle to your compass lanyard.
2. Sun Protection
Sun glasses and a sunscreen are an obvious addition to a pack. Sun protection should come from SPF 35 sun screen lotion, dark glasses approved for altitude and reflective snow fields, and long sleeves, gloves and hat rated for strong sun. Have a sun skirt on the hat or wear a bandana under the hat and over your neck and ears.
3. Insulation (extra clothing)
This brings us to extra clothing – the most essential of the list. In Central Oregon, the weather can change in a very short time, leaving people shivering in shorts and vulnerable to rain, sweat and wind induced hypothermia. Hiking fast may keep your body heat up, until you “bonk” or “run out of gas” (glycogen), or have to hike slow with others, go slow to find your way or have to stop and tend an injured companion or stranger.
Cotton clothing, soaked in sweat, rain or melted snow, hold water loosing 70% of its insulating value and has caused the death of too many people. Layers of polypropylene, pile and Gortex are the equivalent to the wool underwear, pants, shirts, sweaters and coated nylon jackets of the 70s and before. Polypro, pile, softshells and Gortex had not been invented when Everest was first summited. However, they all used layers to 1. wick body moisture, 2. to adjust insulation and 3. to cut off wind and rain. Remember, layers must be “pealed” to avoid sweat soaked clothes! All of this essential seasonal personal clothing and equipment must be accommodated in a sturdy day/summit pack large enough to hold it. Garments or equipment tied to the outside are likely to catch on something, get wet or lost.
A larger day/summit pack is needed for the light but bulky pile or wool insulation layers in the winter.
4. Illumination
A small flashlight can assist in finding a lost or injured person. Also, many hiking groups have returned to the trailhead after dark. Headlamps now weigh in at 3 ounces!
5. First-Aid Supplies
A first aid kit sized to the trip is a must. First aid supplies can fit in a Ziploc baggie and should deal with cuts and scrapes with small and large Band-Aids, Neosporin and mole skin. In June and July, add mosquito repellent for the woods. Have OTC drugs and a personal prescription pain medication for that broken ankle. Weight can be 4 ounces. Don’t forget the toilet paper!
6. Fire
Waterproof matches and a fire starter can be combined in an adjustable propane pocket lighter. Remember, when you most need a fire, it will be windy, wet and cold. Do not depend on being able to start a fire. Learn how to stay warm without a fire. Don’t try to be a “survivalist”.
7. Repair Kit and Tools
A small knife should be light and sharp – a tool kit knife is heavy and of little use. I carry the smallest Swiss Army knife and six feet of duct tape.
8. Nutrition (extra food)
Extra food should be carbohydrates in the form of easily digested quick acting fat-free fig newtons, jelly filled breakfast bars or ClifBars with a bit of protean to aid utilization. Glycogen (sugar or starch) is the one essential fuel that must be replaced during a hard hike or climb or an unexpected cold wet night under a tree – most people have ample stores of the other essential muscle fuel: fat.
9. Hydration (extra water)
Add extra water or the equipment to obtain it (stove for snow or a filter for summer), to your list. In the summer you may need to drink a gallon or more per day. In the winter you may be able to get by with three quarts if you are careful not to sweat. Use electrolyte replacement powder such as Gookinaid or Gatorade. Remember that only two quarts of water weigh almost four pounds plus 12 oz. for the two Nalgene bottles! Instead, use Nalgene or Platypus plastic bags that weigh one ounce per quart. I am not a fan of bladders, but they are popular at this time.
10. Emergency Shelter
Emergency shelter can range from a 9oz. Emergency Bivy Sack sold by Adventure Medical Kits for about $30. to a four season Gore-Tex $200. bivy bag, pad and 20 degree sleeping bag. You can not shelter on snow without an insulating pad such as the Cascade Designs RidgeRest three-quarter length, 9 ounce ensolite foam pad, strapped to the side of your day or summit pack.