There are challenges with the liquids, though. You can't buy them in stores, so you have to order them online. Also, the companies that produce them have tended to be "cottage industries" that come and go, so it's sometimes difficult to keep up. The other thing is that the labeling will give measurements such as "a drop equals half a tablespoon of sugar", and I have found that what is a "drop" is not always exactly the same (right now I have a batch where a drop seems sweeter than usual, for example).
It turns out that there is someone who has looked into the different brands of sucralose and attempted to find out exactly how much sweetness is in them by actually measuring the amount of sucralose in each. Additionally, he has figured out how much it costs to buy a cup of sugar equivalent, much as I do in my article about liquid sucralose. His name is Ralph Cuthbert, and he has posted his findings here. The work he has put into this is quite amazingly detailed, and I recommend that you take a look!
Photo Courtesy Sweetzfree