Is there a store from which I can get green tea extract, fiber, and multivitamins? Or an assortment of stores.

Many pharmacies will carry fiber and multi-vitamins. (I've never looked for it but I suspect they would carry green tea extract as well.)

You can probably find vitamins at GNC in KSK too but you'll pay a hefty premium at that store.

(Mucillin is the name of the fiber....it comes in both "regular" and sugar-free varieties.)

The most healthy tea , Japanese Matcha tea (made in Thailand) can be bought in almost any health store and also supermarkets. It's green tea powder that contains more antioxidants than any other green tea. I drink 2 cups daily .