If you've received SMSes, emails, tweets, or even read it off your facebook wall about someone from the Pepsi Co. contaminating the drinks with his/her HIV-infected blood, please think, research, before spreading nonsense online.
Oh yes, reminds me about Chen Wencong's appeal for blood, another silly case, read about it here.
Another silly person spreading the hoax.
At any soft drinks production line, it is pretty much impossible to infect just about anything, everything is computerised and from what I know, it is a common practice for them to check batches of drinks for quality control probably every 15minutes.
With the heat from the production lines, the average 2.6 to 3.0 PH levels of carbonated soft drinks, even if someone managed to pump in his HIV-infected blood, the cells will not be able to survive, they would be destroyed by the acidic soft drinks.
Example of a production line, the speed and quality control
But, if you're still worried, I suggest checking out if you're HIV-infected at this location in Singapore, do that note of the window-period for HIV detection in human blood, which is about 3 to 6months.