What gear do I need?

I am going to separate the list between essential and optional. (This is the gear I have)

Essential:

• Water bottle. 1 -1.5 Liter Nalgene. ($5-10) 
• Water Bladder. 4 Liter MSR Dromedary ($30)
• Water Filter. MSR Hyperflow ($100)
• Stove. Snow Peak GigaPower Stove with Piezo (built in starter). $50
• Lighter. Any cheap brand will do ($1-3)
• Cookset. Snow Peak Hybrid Trail Cookset. Includes 1 pot, 1 frying pan, 1 spork, and 1 bowl. ($56) 
• Compass. Suunto A-10 Compass ($10)
• Sunscreen 
• Sunglasses. Target brand. $20
• Hat. Sunday Afternoons Adventure Hat ($38)
• First Aid Kit. REI Day Pack First-Aid Kit ($13.50)
• Headlamp. Black Diamond Revolt Headlamp, 90 lumens ($60)
• Knife. Gerber Big Rock Serrated Knife. ($40)
• Multi-tool. Gerber Crucial Multi-tool. ($40)
• Backpack. REI Crestrail 70 ($239)
• Day/Summit Pack. REI Flash 22 ($50)
• Sleeping bag. Marmot NanoWave 45 ($80)
• Sleeping pad. Big Agnes Air Core ($60)
• Tent. Big Agnes Copper Spur UL 1 ($350) but I got it for $25 at an REI used gear sale.
• Bear Canister is required if spending the night on Whitney. Rent them at Ranger Station for $2.50/day.
• Sports Watch. Pyle Sports Weather Master VII w/altimeter, barometer, thermometer, compass ($50)

Optional

• Chair. REI Flex Lite Chair. ($70). 
• Sleeping Bag Liner. Cocoon Silk Mummy Liner, adds 9.5 degrees of warmth ($60)
• Footprint (goes under tent). REI Half Dome 2 Plus ($30)
• Pillow (hint: you can use your jacket as a pillow)
• Collapsible bucket for water
• Sandals to relax at the camp (if you're not too cold)
• Trekking Poles. Help distribute weight. Almost tempted to say they're essential. BAFX Products Anti-shock poles. (Amazon $25.50)
• Ice Axe
• Crampons
• Microspikes. Kahtoola MICROspikes (Amazon $50-60)