Bengaluru's acute water shortage is slowing production at its garment factories, doubling restaurant water bills and forcing managers at some global firms in "India's Silicon Valley" to accommodate unusual employee demands. 

The southern Indian city is home to about 14 million people, thousands of startups and international firms from Walmart to Alphabet's Google. 

"My team is skipping meetings to chase water tankers," a senior employee at Dell DELL.N said on condition of anonymity, lamenting the hit to productivity. 

The shortage, caused by weak southwest monsoon rains that failed to replenish depleted groundwater and the Cauvery River basin reservoirs, has already forced residents to ration water use and pay almost double the usual price to meet their daily needs. 

"This is just the beginning of summer, we don't know how it is going to turn out," said Chethan Hegde, head of the Bengaluru arm of the National Restaurants Association of India. 

Some restaurants are considering using disposable plates to save on washing-up, while others are putting up advisories in restrooms and training staff on how to operate with less water. 

Larger companies are changing tack too. 

Microsoft is using tap aerators to control water flow and recycling water in the washrooms at its office in Bagmane Constellation Business Park, an employee said, citing a memo sent to workers. 

Walmart, which implemented similar water conservation measures well before the crisis, said it was also encouraging landlords to use recycled water for landscaping and gardening. 

Some employees who live in water-scarce areas prefer to work in the office, a senior Accenture employee said. 

Microsoft, Dell and Accenture did not respond to requests seeking comment. 

The crisis has reached Bengaluru's factories too. 

"Manufacturers cannot afford to stall production, they are trying their best to go on, but work has slowed down," South India Garment Association President Anurag Singhla said. 

TENSIONS RISE 

The situation worsened this week when some providers of water tanks - which the city relies on when river and groundwater levels are too low - went on strike after the state government moved to regulate them. 

Dealers hiked prices for a 12,000-litre tanker of water to as much as 2,000 rupees ($24.19) in February, from 1,200 rupees ($14.51) in January, found last month. 

The city has capped the price of such tankers commissioned by the government at 1,200 rupees per unit, according to a March 6 order seen. 

The government has also allocated 5.56 billion rupees ($67.24 million) to deal with the water shortage but some industry captains are not very hopeful. 

"(The water board) had promised us treated water, but we don't expect to get that until next year," Peenya Industries Association President H.M. Arif said. "Already, micro industries are on oxygen and higher costs will lead to losses and they will have to be closed if the situation continues."