We're getting worried for my granddad.

He's had a uti infection for about 4 months now with each antibiotic getting stronger and stronger each time.
The last time my grandfather was given a higher dose I told my nan if nothing changes she should push for blood tests.
Im worried that the infection has spread. He's complaining of having poor sense of taste and appetite and he's losing a lot of weight.
I desperate to find out what it is.
I'd hate for it to be the big C.

So far he's not had a fever or complained of pain so it may not be as far as his kidneys yet, but this is getting worrying.

Today I told my nan to get some things to boost their immunity and boost his appetite/weight.
Sauerkrout, hummus, kefir and real cranberries to make their own cranberry juice. (since everything is filled with sugar)