Mineral Water???

Try boiling the UK water first..let it cool and put it into a thermos....the plastic of bought drink bottles contain a material called bisphenol that maybe causing the adverse effects you are experiencing..or drink from a water filter..... best wishes.....

Here in Australia the local TV program did some testing of bottled water, less clean than the tap water, much more bacteria, which was scary, but I would be very careful unless you knew the local water treatment process and how good it is.

I have gastritis as well, and find I have to watch what food I eat, beef after lunch time becomes a nightmare of pain and ongoing problems for weeks, Dad was the same, ended up not eating in the evening, main meal of the day became lunch.

I stick to chicken, fish, not overly spicy, so may not be just the water. Garlic and ginger for me are a NO NO, even only a small amount. Diffucult when dining out, even when asking for none in the meal, got caught out recently, beautiful meal, but there must have been garlic in it, even though assured there wasn't, wondered after the first mouthful, it was soooo yummy, have to be careful even with onion, can upset me on the day.

Also cannot eat anything with cinnamon, seems to make me very bilious, love the taste, but pay a nasty price for the joy, only eat in the morning. 

Surprisingly I can eat tiny amounts of chili, almost not able to taste.

Indian lady told me its good for me, she was right, and I do use in my own dishes, even to sprinkling tiny dusting on omelets, and fritata, love my fritata, and such fun to mix up new versions, husband not so keen on chili hates it.

Seems to be such a contradiction.