Don't scrimp on boots. Make up for the added weight of stout boots elsewhere in your kit. Water Bottles . Notice the plural. You should have a quart of water on your waist or otherwise at hand while you're walking, and at least one additional water container for camp.
Dehydration is the major cause of problems large and small on backpacking trips.
Much has been written on that subject, so I won't reiterate it here. Day Pack . A fanny pack or real day pack folded up in your backpack is a very good idea. You never know when you'll need the extra carrying capacity and having one makes even unplanned day hikes more practical. Eating Utensils .