>>441514I decided to use my phone as GPS the entire way. I bought a solar charger, hoping it would be enough, but after 5 days, it was clear that I needed an external battery as well. Only one I could find was some crappy one with a 1amp input.
I recommend getting a 2amp input one with at least 15000mAh. Otherwise you'll spent too much time looking for public electrical sockets. When you do have to charge, look for libraries and churches. Water was also pretty easy to come by, since you could just go into any graveyard and use their water tap to fill up.
Also, don't be afraid to ask strangers for help. I spent some time in other people's homes, taking showers, eating and charging. Even got all my clothes washed. People tend to instantly respect you when you tell them how far you've walked and will usually ask if they can help you in any way.
In terms of uselessness, I brought to much personal hygiene stuff and my first aid kid was way too big. Just pack the absolute most essentials. Remember, you can always buy stuff while hiking.
I also bought food for 4-5 days at a time, which in retrospective was overkill.
I also brought a water filter, but I never used it since I could always find fresh water.
In terms of sleeping bag and sleeping pad, I would go for something lighter, than what I brought. My sleeping pad was 1,2kg by itself.
The sleeping bag was a 3 season bag weighting 1,6 kg, but it was worth it. Especially near the end of my trip.
Also, my most prized possessions was my mini folding shovel. Half a kg. I used it to flatten out the ground before pitching my tent every night. I also used it, when I got stuck in a dried out water pit. Had to dig out steps so I could get out.
