You will see lot of brands in the market. Amano is the first one they had Japanease sheets not sure now they are there anymore. Admo is also good. But make Sure to get the one with higher gauge if not you will be f*kd up. Best is to visit these places and get an idea of the size gauges first.
https://www.squattypotty.com search for daraz you may find similar one. If not get one made
Also if keep 4 glass bottles and make sure to drink, also eat lot of food with fiber, watermelons etc. It will work out.
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Machan Ranidu Lankage is Yale he won a scholarship also there is someone I know got a school from Cambridge (humble person).. But they haven't done any innovations though.