Okie.... I ended up buying the original flavored ラムネ (pretty much tasteless to me... prob because loads of Singaporean soft drinks are very sweet).  shows the unopened bottle. Kinda looks like a normal soft drink in a glass bottle but looks can be deceiving, ya know! So upon closer inspection, there are interesting labels like in  and  as to how to open the bottle.... Basically there is a little plastic t-shaped thingie that you use to unseal the bottle by pushing the glass marble dn ^^
So ya, after removing the normal plastic seal thing at the top, the bottle ends up looking like , where the geen plastic bits at the top just sitting there, and come apart like in . The smaller plastic bit on the left is the "t-shaped" thingie used to push the glass ball down...
Now comes the troublesome part..... the proper unsealing, so that I can get to my drink....  shows how u shld place the plasatic bit, and u gotta use A LOT of strength to get the darn ball down!! I tried, didn't work.... Mom tried, didn't work... Went to get a flat pebble we had, I held on to the bottle, and Mom went "wham" on the pebble, and the glass ball *finally* went dn.... You can sorta see it fizzle-ling in 
Just in case that wasn't large enough, here are some close-ups of the bubbles forming ard the ball... other than those little bubbles, there wasn't much excitement *lol* And yea, Juan (along w sibs and mom) proceeded to finish the 200mL of drink there was.... Not really a lot, but I only understood how THICK the walls of the bottle are after we finished the drink!!
Well.... here's the emptied product... The bottle is contoured in such a way that the glass ball doesn't fall all the way down but instead stays some where in the middle.... Well, now Juan has a nice noisy, albeit heavy, rattle on my table ^^ One good thing that came out of this is that now I have something ready for Japanese 4 culture presentation (photos and bottle alike!! heehee... might even get another bottle just before the presentation so I can demo how to open it ^^)