In my memory, remember that the whole village was covered withmpletely flooding,ed and our crops were all damaged, so we whole villagers becamein the eyes of the government, we villagers were considered victims of thea natural calamitydisaster.

Or "we were registered as victims of a natural disaster." "Calamity" is a synonym for "disaster," but it doesn't sound quite right (at least not to my ear).

As disaster relief products, we were given a bags of rice.

or "we were each given a bag of rice"

We never groew rice in our area, so I haved never eaten rice before.

I remember that my mom usually puts some rice in the hot-water bottle, and then I canould eat the rice porridge half a day latelater that day.

I know what you mean by "half a day late," but it doesn't sound natural.

I think it iwas the most delicious rice porridge I have ever eaten.

Even now, I can remember its taste clearly, but when I tried to do it once again, I found that it didn't taste as good as before when I tried to make it again.

As a side note - what you wrote is correct, except that you need a comma after "Even now." My version was a purely stylistic suggestion.