Water Tanks and Tent Drying

i normally let tent camper dry for a week and put some bicarb in the tank and let it soak for a couple of days then flush dags

There's a product called Tankclean you can try; or else Milton's baby bottle steriliser from the supermarket.

We had very bad taste in our tanks, tried packets of bicarb did nothing the only thing that worked was 3lt of vinigar in each tank fill to the top and leave for a couple of days then flush.

Canvas needs to be bone dry - any dampness will cause mould - the longer you leave it to dry out the better - friends had mould on their CT at Christmas - got the spores off with soap and water, then treated with chemical from camping store - but you can use vinegar or weak bleach solution - trouble is it stains - and that is what is the hardest to remove.
jules

What hose did you use to fill the tank?
Normal garden hose or a food grade one?
Buy a food grade water hose from Camec or similar and that will eliminate one possible cause for bad tastes.
What does the water you are putting into the tank taste like before you put it in?

If my camper gets wet (usually rains when in the middle of packing up:( ) I try to set it up when we get home and leave it up for at a day, it all depends on how wet it got.

Cheers

Go with what Sigmond has advised, it should work.
When filling the tank using a hose it is always a wise move to run a few liters of water through the hose before filling the tank thus avoiding any contamination from residual water that has been laying in the hose.

All tents should be packed up completely dry to avoid mildew etc. However often this is impracticable due to weather or some other condition, thus it is advisable to erect the tent as soon as possible after you arrive home to let it completely dry and for cleaning the interior. If the weather is sunny and warm when you do erect it, after cleaning the interior give the outside a good hosing down.
Also note that fly spray in a tent is detrimental to the canvas so sometimes an interior hose down is warranted.

the army just uses vinagar and water for there camelbacks bladers its a cheaper way to do it.