Also, if you have the time, consider thru-hiking the JMT (John Muir Trail). It's a segment of the PCT; it goes from Yosemite down to Mt. Whitney. ~220 miles, generally takes people 2-3 weeks. Pack light— rain gear, clothes your wearing, 2-3 extra pairs of socks, a pair of long johns, a light but warm beanie, a yowie (not arctic yowie) (they're amazing for way more than skiing), a water bottle (one will do you fine, there is a lot of snowmelt up there. It's a fairly safe bet to assume that the high alpine streams will be safe to drink from if you collect from the right spot. If you want to be super sure, bring a Steri-Pen, it's the best thing for purifying water. Equally effective as boiling it but way quicker.)
Bring a sleeping bag rated to +20 or so, a small light sleeping pad, and a thin light tarp to sleep on. Tents are overkill in the Sierra in the summer. If you want a bivvy, go ahead, but that's just useless weight IMO.
Hell why am I telling you this shit? If you're going to hike the JMT, you probably already know most of this, if not, then it's no point.
One last thing I'll add because it's important: bring enough *salty food to keep you from becoming hyponatremic. If you feel like you are dehydrated even though you've had more than enough water and your urine has been clear, you are very likely just low on salt. Cramps are another telltale sign. If you are, eat salty food... doesn't have to be potato chips or something, a PB&J made with non-organic PB, wonderbread, and non-organic jelly will be plenty salty. Wash it down with water, but don't drink too much at that point.
Also, pink snow = BAD BAD BAD. If you see it, don't eat it, if you see it right above where you're collecting water, disinfect that water or find another source. "Watermelon snow" will make you very, very sick.
