Your loved one may be tempted to drink less, but this can make the urine more concentrated, aggravating the bladder and making it more active. Encourage them to drink as normal responding to their natural thirst. This should be enough to keep the urine a healthy, pale straw colour. As you might expect, drinking too much will just increase the urge to "go" so just try and keep a healthy balance.
Interestingly constipation can mean that the bowel is placing pressure on the bladder causing problems with being able to hold more urine and additonally to hold onto it. Sometimes increasing fibre and fluids will improve the constipation and also the need to urinate regularly.
Additionally constipation can be the cause of faecal incontinence, faecal impaction caused by constipation can lead to faecal oozing. Fixing the constipation may fix the faecal incontinence. A specialist continence advisor will be able to provide you with a more personalised plan.
Be aware that some drinks have a diuretic effect
Of course you don’t want to curb your loved one’s pleasures but be aware that caffeine, alcohol and fizzy drinks are diuretics which will make them need to visit the toilet more.
Out and about
Make sure they have a spare product and plastic bag for the disposal of a used product in their bag or coat pocket. Arrange for a seat near the toilet on trains and planes and ensure car or coach drivers plan regular toilet stops on long journeys.