I've actually traveled to Thailand before so I know some basic phrases.
Hello (male speaker) sawatdee krup
Hello (female speaker) sawatdee kaa
How are you? sabai dee reu
Fine thanks sabai dee
Thank you kop koon
Thank you very much kob-khun-mark
You're welcome mai pen rai
Never mind mai pen rai
I can't speak Thai phoot Thai mai dai
I don't understand mai kao chai
Do you understand? kao chai mai
Where is the rest room? hong nam yoo tee nai
How much does this cost? nee tao-rai
What is this ? nee arai
Very expensive paeng maag
The bill please gep taang
Good-bye la gon
See you again laew phob gan mai
Good luck kor hai chok dee
Sorry/excuse me kor thoad
Yes chai
No mai-chai/mai-oua
Please ka-ru-na
Excuse me kor-tose/kor-a-nu-yart
And the phrase that I've used most often, buat tong(stomach ache) the first few days of my travels. I guess, I don't a Thai stomach

But I love the Thai cuisines. I'm curious do you know of any that's non-fish related? I know that a lot of Thai dishes have fish but I'd like to sample more with beef or pork.