You can buy the savoury drinks from your counsellor - you can drink them at any time (don't have to wait for ketosis) but you shouldn't have more than 2 a day. If you look at the sheet your counsellor gives you to fill in for packs you should see it at the bottom along with the powders you can add to your water.
A lot of people buy Marigold Boullion from the supermarket though and use this instead of the savoury drinks as it is a heck of a lot cheaper.
They cost £5 and you get 14 sachets, expensive I think. I like them because they do count as part of your 4 litres, and I like a hot drink and struggle getting 4 litres down so end up not having many hot drinks.
You can put tabasco in it so I have heard from this site.
the marigold boullion swiss vegetable tastes like chicken noodle soup, its lush, you can get the lo salt also, if you cant the ordinary ones are no problem just dont put intoo much as they can be real salty.