Hard water and limescale

You can leave a hard water tap in the kitchen if you don’t want to drink the softened water. You can also get a sort of water softener that doesn’t use salt but uses a small amount of electricity I believe, which separate the scale so it doesn’t stick to surfaces. I’m not too sure how it work to be honest but it might be worth investigating.

I grew up in a hard water area, so knew no different, but then I went to live in a soft water area. It`s much better for washing, but horrible to drink, it has a limey taste. Now we`re happily back with hard water.

I am currently at my mum's in a hard water area (Where I grew up). I much prefer the drinking water here I have to say! Mum has a separate small tap on the sink that runs soft water & she uses that for cooking but it doesn't treat the bathroom plumbing unfortunately. I too have to wipe down the walls and shower screen BEFORE I get out of the shower which can be a chilly job!!
Sounds like you should take professional advice about your tiles and how to treat them safely OP and maybe invest in a softener if you can afford to ?