In addition to previous ...

In addition to previous comments, I would advise caution if using household products for chlorinating water supplies - these products are not intended, manufactured or approved for consumption and may themselves cause illness.

In the UK there are lots of approved products for disinfecting water supplies and for emergency disinfection, something like Instachlor/Steadichlor would probably be a good product to use.  These are produced in a tablet form and normally have dosing instructions on the packaging.  It would be important to at least try and follow basic chlorination principles so as per previous comments, it would be best to chlorinate into tank, ensuring all of the water is chlorinated (ensuring breakpoint chlorination is achieved - particularly if ammonia is present) ensuring minimum contact time is achieved.  It would also be a very good idea to be able to measure the free and total chlorine level in the water (and aim to achieve a difference of less than 0.2mg/l) - there are simple-to-use non electric products (comparators) produced by companies such as Palintest/Lovibond that could be utilised.

It's also worth noting that chlorine based disinfection will not necessarily remove all harmful pathogens - there are many that even high levels of chlorine will not remove.  Effective disinfection by chlorine (like all other forms of disinfection) requires the water to be free from turbidity/suspended matter (and other challenges) - this may require further treatment such as settlement/filtration prior to disinfection.

I would finally comment that assessing the point of supply for sources of contamination would be as important as disinfecting it; there should be no potentially contaminating activity (sewage tanks/latrines, livestock etc.) within 50m and the head-works of the asset should be raised above ground level and capped.  There is a lot of information online regarding correct protection of such assets so I will not repeat it here.