Thousands of people have been queuing for bottled water after losing their mains supply for a second night.
An area of about 40,000 people was affected when the outage hit on Friday evening.
Anglian Water says it has restored supplies to "many customers" – but "some in Leighton-Linslade, Pottsgrove, Milton Bryan and Southcott are still without water".
Billpayers say they are furious that fixing the problem is taking so long.
Maria Power had to queue for 45 minutes at a Tesco in Leighton Buzzard where Anglia were offering free bottled water to those affected.
The 34-year-old said: "There was probably 50 people in front of me, and it continued growing behind me.
"The situation is disgraceful it should have been resolved by now."
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Local resident Dave, 39, said: "As I passed (the water queue) two friends drove by and called out 'we're off to Milton Keynes for a shower'. It is shocking.
"'Love Every Drop' is Anglian Water's slogan, but my cat had the last remaining water I had, that was what was left in the kettle."
Anglian Water, which has apologised to customers, says the problem was initially caused by a broken valve and then by "air trapped in pipes".
It also said it is using tankers in the meantime to "bring as many people back on to water as possible".
Ms Power said she could not understand why it had taken so long to restore supplies, adding: "Apologies don't quite justify the timescale.
"I'm angry at the water company that they are going to leave people without water for nearly 48 hours."
Anglian said on Sunday the problem would be solved "later on this afternoon".
Earlier during the weekend, it had said the problem wouldRead More – Source