Buses are air conditioned and fairly comfortable. Buses have on board toilets, but bus movement can make these challenging to use. Bottled water and small snack cakes are normally provided to you on the bus.
Buses between Nang Rong and Bangkok make a twenty minute stop about midway at a company owned facility to use the restroom and eat a quick meal. Hot food is provided at a small cafeteria by showing your bus ticket, but some of us have found it less than satisfactory. The ground chicken had bits of bone in it. It may be that Thais are accustomed to that, but I have not had that in any other restaurants. Some of us pack our own lunch.The restrooms are fairly new and adequate and a handicapped restroom, with interesting signs, is provided. Whenever you travel in Thailand it is a good idea to have your own toilet paper. In an emergency, check out the handicapped restroom, it may have some.
You will arrive at the Mo Chit bus terminal. Immediately when you get off the bus there will be people saying "Taxi! Where you go?" Ignore them, get your luggage together and say "meter taxi". Go to that area and you can get a taxi to most areas in the city for about 100 – 200 baht. If you are not going to tell the driver "airport" it helps to have a card with the name and address of your hotel in Thai.It is easy to see why Thailand has long been a major vacation place for the entire world. The people here are friendly in a way that is in marked contrast to other destinations in Asia, and it gets even better outside of Bangkok and the major tourist areas.