Welcome to VFTT. This site is a great source of information. Below is a list, from various sources, of recommended items for day hiking. For overnight you will need to add sleeping and cooking gear.
Ten Essentials
The special items that should ALWAYS be with you:
1. Map
2. Compass
3. Flashlight/headlamp
4. Extra Clothing
5. Extra Food
6. Sunglasses
7. First aid supplies (include an extra day of medication you are taking or might need in an emergency)
8. Pocket knife
9. Matches
10. Fire starter
Outdoor Clothing
Boots: Of heavy lug construction, they should fit comfortably snug with free play for toes and with little or no slippage on the heel. The boots should be weather proofed and broken in before hiking.
Socks: Four pairs recommended; two of lightweight nylon and two of heavy wool. Wear one pair of wool socks over one lightweight pair. The other two pairs go into your pack in case you need dry socks.
Pants: Constructed to be loose, warm, comfortable, and quick drying. For added warmth, wear polypropylene underwear.
Shirts: Light, man-made fiber - such as bunting or nylon pile - recommended for good insulating quality and quick drying.
Jacket: Mountain style with a hood, wind-proofed, water-proofed, and sized large enough to cover more insulating clothes worn under it.
Head Covering: Styled to retain body heat or provide shade as changing weather dictates.
Gloves or Mittens.
Rain Gear: A lightweight poncho, or rain pants and hooded parka.
Equipment
The following list of items, in addition to the ten essential, is designed to support life under any trip emergency in the backcountry, regardless of the season or weather conditions. Learn how to use it. Keep it always in your pack and check the condition of these items periodically. Your life may depend on it.
• Wire saw. The saw is for cutting large pieces of wood for an emergency fire.
• Space blanket. The space blanket can be used as a wind breaker, heat reflector, and as a signaling device for air rescue. Wave the red side up when standing on snow; the silver side up when standing on dark grounds.
• 3 large plastic leaf bags. For quick rain and wind protection, put one bag over your head, the second around your legs, and the third over your backpack. Make a gap in the first for breathing.
• Duct tape. This is handy for general repairs to space blankets, clothing, tents, boots, etc.
• Ensolite pad. Reduce body heat loss by sitting or sleeping on pad instead of cold ground.
• Metal cup to melt snow.
• Extra safe (boiled or filtered) drinking water.
• Iodine tablets or water pump
• Whistle and signal mirror and 50 feet of parachute cord.
• Sun cream, chapstick.
• Toilet paper.
• Insect repellent.
• Extra pair of glasses (if you wear glasses).
Recommended First Aid Kit
(No.) Item Use
(1) Triangular Bandage Hold compresses or splints in place.
(1) "Ace" Bandage Supports weakened limb joints. Holds compresses or splints in place.
(3) Sterile pads 4"X 4" Dress large wounds.
(1) 4" bandage compress Dresses large wounds.
(6) Band-aids Treat small wounds.
(1) Roll of adhesive tape Holds compress or splint in place.
(4) Moleskin tape squares Prevent and treat blisters.
(3) Antiseptic towelettes Cleans wounds
(2) Antibiotic ointment Treat small wounds
(4) Acetaminophen Relieves aches and pains.
or Ibuprofen Tablets.
(1) Small scissors Cuts moleskin and tape.
(2) Safety pins Hold compresses or splints in place. Open blisters Make arm sling from shirt sleeve.
(1) Tweezers Remove splinters and ticks.
(1) Backpack medical guide
(1) Waterproof Bag Holds all of the above.
see below for Word.doc version of this list