I've learnt to travel with the basics over the years as my scuba kit takes up 90% of my allowance. 
Thailand isn't some backward place full of mud huts.
There are launderettes dotted about. 20 baht for a machine wash.
7-11 shops for sundries and billions of clothes shops selling towels, t shirts, shorts.

Thailand isn't some backward place full of mud huts.
There are launderettes dotted about. 20 baht for a machine wash.
7-11 shops for sundries and billions of clothes shops selling towels, t shirts, shorts.