It was quite hard to find the right size of test tube to fit the right amount of rice needed for one portion.
My calculations were that the rice I will be using needs 75g for each portion. I them worked out how much this was in relation to liquid space to find the amount of ml the tube would have to be to fit the rice in. I came up with 100ml as my answer and therefore needed a bottle to fit this amount of rice in.
The image below is are the test tubes that I bought.
These are the corks that I bought for to fit in the top of the test tubes.