how much does it cost per day (not including travel) to stay

>>1075777
If you're willing to stay in a hostel dormitory, accommodations in both countries can be had starting at around $5, although most are a bit more than that. Private rooms start around $15 but will likely be grim. Basic but decent 2-3 star places can be had for as low as $25 or so. Street food is in my experience slightly cheaper in Thailand than in Cambodia unless you speak Khmer and can access the local places (and even then you're going to be charged more than a local would be). Sticking to street stalls and night markets, you can eat for $1-$3 per meal in Thailand, $3-$4 meal in Cambodia.
>tldr--somewhere between $8 and $34 per day, depending on a lot of factors.

>>1075777
Both countries are listed here with prices in USD http://projectinspo.com/2015/03/10-of-the-cheapest-countries-to-travel-to/

>>1075867
Pretty much this. I mean, there is some variation - in bkk and some smaller cambodian villages you can get a private room for $5 but good luck finding a dorm under $20 on koh phi phi, generallly though this guy's prices are on the ball.

>>1075777
>no drinking or hookers
So, why are you going to Thailand and Cambodia?