Keep visibility equipment such as flares or reflective hazard triangles in your vehicle in case of roadside trouble. Consider an LED flameless flare which will last longer than its traditional counterpart.
Hydration is key when it comes to staying healthy during the summer months, so be sure to keep water in your vehicle at all times. If you're planning a road trip, plan on one gallon of water per person.
You may not need the blanket to stay warm, but you can use a reflective emergency blanket for shade. If you don't have a reflective blanket, the blanket from your winter car survival kit will work to shade you from the blistering sun.
A Small Tool kit
A small tool kit is one of the 15 things you should have in your car year round. Include an adjustable wrench, some duct tape, a couple screwdrivers and pliers—you never know when a simple tool might help to get you back on the road.
First Aid Kit
A first aid kit should be part of every car emergency kit. Include some ointment, gauze, bandages, adhesive tape and tweezers. For those with life-threatening allergies, include an EpiPen.
Purchase a couple sunscreen sticks to keep in your glove compartment or your first aid kit for times you're stuck in the sun. When they're empty, you can use them as a clever way to store cash in your car.
Flashlights are one thing every DIYer should own, and it's smart to keep one in your car. An LED flashlight is a good option since the batteries and the bulb will last a long time.
The last thing you need when stranded is for your phone to die. Keep a spare charger in the car, but don't use it to charge your phone regularly.
Tire Sealant and Gauge
You can stop a flat tire before it happens with tire sealant, which can quickly repair the punctures up to 1/4-inch in diameter in the tire's tread area. Use a tire gauge to make sure your tires are properly inflated.
Jumper cables can come in handy throughout the year, not just during the winter months. Before using, make sure you know how to jump a car safely.
Keep some snacks, that won't melt, such as granola, dried fruit and nuts in your car emergency kit. Use a recycled container for storage.