How to save battery life on my iPhone? - 1

So I'm going on a class field trip thing on Monday, and my phone tends to die really, really quickly. I have an iPhone 5 and I'm not sure if there's a place to charge my phone on the bus. It's a two and a half hour ride, we're leaving at 6:15 am and getting back at around 5 or 6 pm. Usually my phone just barely lasts for one school day. At the end of the school day it'll be at around 20-30%. I'm probably gonna need my phone to text my mom when we get back, so what are some tips on how to save battery life?

Yellow marks on my iphone screen?

My screens been cracked for a while I'm about to get it fixed but recently some yellow colored stains have appeared on it. Can I get rid of it? Why are they there?

Is there a way I can use my PC's internet connection for my iphone Wi-Fi?

I don't mean tethering, to use my phone's internet for my PC, I mean the other way around.

You see the router is in my roommate's room down the hall, and while my PC is hardwired into it (ethernet cable), my phone's Wi-Fi is quite weak (1-2 bars) and drops frequently, because it's going through several walls.

Is there a Wi-Fi receiver adapter or something I can use to allow my iphone to connect to my pc's fast internet connection?

Is there spyware on my iPhone?

So sometimes when I either close out of an app, or I switch between applications, I see this big red bar across my iPhone screen. I have an iPhone 5s, it's not jailbroken, and I'm kind of worried. What is this? It looks like something is recording my screen

Mophie Case problems (iPhone 6)?

So for my Birthday, I got the Mophie Juciepack Air for the iPhone 6. I was really excited to start using it as well as my new phone. I plugged in the case, but after about 10 seconds, the light on the back to show it was charging just suddenly stopped blinking. I'm not sure what to do, my parents spent $100 on the case and we all really want it to work

How to reset a jailbroken iPhone 4s?

I want to reset a my jailbroken iPhone 4s but I'm running into multiple problems.
1) I accidentally deleted Cydia before I could remove all of the tweaks from the jailbreak.
2) I don't have a computer for the iTunes reset.
3) If I sign into my Apple ID after I reset, will all of my iTunes music still be there?
What do I do? I'm not good with technology.

IBook missing from iPhone 6 plus?

I had my iPhone backup to the computer before I took it to the Genius Bar. I ended up getting a new phone. I got home and restored it however, all of my files in the iBook disappeared. I saw it for about 3 seconds when it disappeared after I touched it.

How can I get it back? It's not in my iTunes iBook section nor is it on my phone.

Why won't my iPhone 5s connect/stay connected to my Wi-Fi?

I have reset phone back to factory settings. I have reset network settings. It connects briefly then disconnects and says it can't join network. It's recently started telling me I have an incorrect password (I'm typing it correctly)
Both my laptop and tv are having no problems connecting.
Hopefully someone can help me out. I won't be able to go into Verizon until the weekend. And if it's something I can fix on my own, I would rather do so.