What is an appropriate document to prove your current location?

I’m submitting my 60 day tourist visa application today but there are a few questions i’m unsure of how to answer.

1.

Travel booking confirmation.

- Flight details showing applicant’s name, departure date, all flights en route from UK/Ireland/UK territories to Thailand and onward flight to another destination.

There is only one box to submit my jpeg. i have only booked a one way flight so my flight itinerary will show this. how do i submit a second jpeg of an onward flight ?

2. Document that can verify applicant's current residency (Applicant must apply for e-Visa via specific Embassy/Consulate conforming with his/her consular jurisdiction and residency.).

- Applicants are requested to submit their local utility bills eg. electricity bill/ gas / mobile phone / rental agreement.

I live with my Father so no bills are in my name & my phone is pay as you go. what can i use ?

Thanks in advance