@@CookingAhPa thank you, that would be simplest I would imagine. When I get my wheelchair I am going to have to do the two hours journey to the big city and see about getting it, it does look really good :)
Malaysian and Singaporean cuisines or Chinese cuisines do not use fish source but in Thai and Vietnamese cuisines only. Anything can be thrown in to make the fish sauce. Please don't claim be making Singapore or Malaysian dishes when you throw in fish sauce.