used items can replace commercial yellow cups.
if you go for commercial (hydroponics farming), it will be like the pic below.
On the minerals/nutrients and seeds, we will discuss in other postings (if time permits) -- (panjang sangat ngomel pun orang boring). All i have to say is these items are readily available (just email me -- Din, i'm interested to have this and that, i want to eat more vege or my neighbours want me to grow kangkung for them.. etc).
The most important thing is that if you think hydroponics is good for you (and neighbours), go do it today.