You will need to buy and drink bloxy cola to get the Taste Tester Badge. This guide will let you know how you can get the bloxy cola and then Taste Tester Badge in Roblox Break In.
First, you will need to wait for the Sewers Sequence which happens near the end of the story. 
And then you have to do the Obby on the right. 
Once you’re there, you need to Buy the Bloxy Cola for 20 Bucks. After getting the Cola, drink it to get the Badge. 