The phrase "refill it with" is grammatically correct and commonly used in written English.
It is typically used when talking about filling something again with a substance or liquid. Example: "After finishing my drink, I asked the waiter to refill it with water." In this sentence, "refill it with" is used to indicate that the speaker wants their glass to be filled again with water.
After taking a little time to read the directions and prime the unit for its first use, you only have to refill it with tap water when necessary.
She set her cup on the refreshments table and bent down to refill it with seltzer.
When your pitcher is empty, tilt the lid of your teapot and Manjivar will come and refill it with water.
I ordered a tumbler of water, drained it, and began discreetly to refill it with whiskey from my own flask.
Of course, for most people, the simplest recycling solution of all might be to wash a plastic bottle out and refill it with fresh water from the tap.
When a bottle becomes full, empty it, then refill it with tap water, which will now have a zesty coppery taste and reduce your various mineral deficiencies.
She showed us how to do it properly: she emptied the full cup onto a sheet of wax paper, and laboriously refilled it with a spoon.
Businesspeople who visit the same country often have a cheaper alternative: buying a prepaid phone in that country and refilling it with extra minutes as needed, or signing a service contract with a local carrier.
Ms. Cunningham's passion became turning a cistern that had been boarded over for more than a century into a swimming pool, a project that would entail removing all the old water (which contained, she estimates, some five dozen rat skulls per 5,000 gallons), coating the pit with sealer and then refilling it with new water.
In such cases, a hospital employee steals a fresh syringe, injects himself with it — thus almost certainly contaminating it — refills it with some other liquid and slips it back into place, whereupon an unsuspecting doctor or nurse uses it on a patient.
The journalist, Alberto Stegeman, said in a report televised Sunday that he had purchased a bottle of rum from a duty-free shop at Schiphol Airport in Amsterdam on Feb. 16, emptied it and refilled it with water before returning it to the store.
