Once you enter the park, there are no places to buy food and water. You will need to bring these items with you. Remember, this is the desert and you will need lots of water! They Park Service recommends that you bring a gallon of water per person per day.
Also, pack a picnic lunch and bring it with you to the park. You'll also want to bring along some snacks.
Luggage and bags:
It depends on what you do. Joshua Tree NP is a day-trip for me so there's very little packing problem. I usually bring a small backpack for the short hikes. If you plan to camp, most camp sites have large parking lot nearby so you don't need to carry things very far.
Clothing/Shoes/Weather Gear: Most hikes in Joshua are fairly easy, so just wear comfortable shoes. Besides hat/visor, it's better to cover up your arms and legs to prevent sunburn and cactus at low ground. The attached photo shows Barker Dam. Swimming is possible here but not recommended.
Toiletries and Medical Supplies: Most camp sites have chemical toilets, but no water.
Photo Equipment: I tested my new digital camera here. Try to keep it away from the desert sand. Easy photo targets include the famous Joshua trees, falling rock climbers, and the every-changing sky.
Miscellaneous: Potable water is hard to find in Joshua Tree NP except the 3 entrance stations. So, bring sufficient water containers and make sure you fill up at the entrance.
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