The stools should be formed but a little bit loose. If you're only taking a tsp at a time you won't have any problem controlling the BM to your timing. You should not experience diarrhea unless you're taking a laxative.
You actually might be constipated for the first several days, as the fiber will be scrubbing off a layer of mucous that shouldn't be there but did help things to move along faster. So if you don't see BMs right away don't worry about it unless you start feeling uncomfortable.
To ensure a BM before leaving for work, drink quickly a large cup of very warm (but swallowable) water. This induces peristaltic action and cleanses the kidneys too! :)