Birch trees are an excellent source of safe water - tap the tree as you would for a maple and allow the water to collect. It is much purer and safer than water gathered by other methods, having been filtered through the roots of the tree.
How To Find Water If You Are Not By A River Or If It Isnt Raining
If it is hot during the day and cold during the night so in the morning there could be dew. If there is dew you might want to take your shirt off and tie it around your leg. Then walk around in grass for about as long as you like. Then your shirt will be wet so squeeze the water out of your shirt and into your canteen.
Use your knife to filet the outer skin of the prickly pear cactus. Wear gloves to protect yourself from the spines. Once the cactus leaf is filet, you can put it in a cloth and squeeze it and squeeze out some liquid.
The red fruit, called tunas, also has delicious juice in it.