You can buy ikan bilis then soak and stir-fry to dry them. No oil and seasoning. Blend the fishes into powder. You can keep them in fridge. Add them when cooking the porridge with vegetable like broccoli and carrot
those supermarkets or you go to wet market stalls that sell dry goods.
for convienence, you can put the ikan bills into stock bags(found in daiso) so u stuff the ikan bills inside, once stock ready just remove the entire bag
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