Water brash

I am looking for an English term which describes the (repressible, but essentially involuntary) bringing up of (often, but not necessarily sour) fluid from the stomach that often accompanies heartburn but may also occur without it, such when you have eaten too much (too fatty, too sweet, too much coffee etc.), in the absence of nausea (normally, at least).
Except for 'to regurgitate fluid' (which seems a bit of an inkhorn term to me), I have failed to find a fitting verb. (I have read about 'to repeat on', such as in "boiled onions always repeat on me", but I doubt this is applicable to what I mean here, since what I mean is not related to any particular food.)
The noun 'water brash' seems to be closest to what I mean. However, I am insecure about its precise meaning(s), since although Dorland and Webster agree that it is acid regurgitation, only the former tells me that the fluid brought up is not necessarily acid (but can also be almost tasteless saliva), while the latter instead states that acid regurgitation is combined with 'excessive salivation' (apparently /invariably/, and this also seems to imply that the saliva present has /not come up/).
Furthermore, Dorland defines water brash as a combination of heartburn and the described regurgitation, while Webster makes no mention of heartburn.
At the risk of sounding like I am splitting hairs, I would like to know:
- is heartburn /necessarily/ present with 'water brash'?

- is acidity /necessarily/ present?
Thanks for any clarification! Of course, I would also be interested in any alternative terms, whether verb or noun.

Florian v. Savigny
(If you are going to reply in private, please be patient, as I only check for mail something like once a week. - Si vous allez répondre personellement, patientez s.v.p., car je ne lis les courriels qu'environ une fois par semaine.)