There is no credible evidence in the provided sources that mixing Coke and water turns into chili pepper or that users report critical effects from such a transformation.
Coke and water turn into chili pepper and user reports some of the criticals

People are just discovering what 'farmer's coke' is - and it's left them completely divided - Daily Mail Online
Source: dailymail.co.uk
Key Evidence
Hawaiian chili pepper water is made from water and chili peppers but does not involve Coke.
chilipeppermadness.comchilipeppermadness.comHawaiian Chili Pepper Water Recipe
Recipes exist using Coke in cooking but do not transform it into chili peppers.
reddit.comreddit.comr/Cooking on Reddit: There's Coca Cola ham and Dr Pepper chili, any other savory...
Drinking soda after eating spicy food affects taste perception but does not cause chemical changes turning Coke into chili pepper.
justanswer.comjustanswer.comWhy do this happen: i eat something with lots of capsicum and then drink soda...
No source supports any transformation of Coke and water into chili pepper or reports critical effects from such a process.
What the Evidence Shows
The input claim states that 'Coke and water turn into chili pepper and user reports some of the criticals.' None of the provided sources support or even mention any chemical or culinary process whereby Coke (a soda) and water would transform into chili pepper, which is a plant-based spice.
discusses Hawaiian chili pepper water, a condiment made from water, vinegar, and chili peppers, but it does not involve Coke or any soda.chilipeppermadness.comchilipeppermadness.comHawaiian Chili Pepper Water Recipe
mentions cooking recipes involving Coca-Cola and Dr Pepper in savory dishes like ham or chili, but these are culinary uses of soda as an ingredient, not transformations into chili peppers.reddit.comreddit.comr/Cooking on Reddit: There's Coca Cola ham and Dr Pepper chili, any other savory...
touches on the sensory experience of eating capsicum (chili peppers) and then drinking soda, noting that soda may not be enjoyable after spicy food, but this is about taste interaction, not chemical transformation.justanswer.comjustanswer.comWhy do this happen: i eat something with lots of capsicum and then drink soda...
Other sources discuss aspects of Coke as a product, its ingredients, or corporate practices but do not relate to any transformation into chili peppers.theguardian.comtheguardian.comHow Pepsi and Coke make millions bottling tap water, as residents face shutoffs
typeinvestigations.orgtypeinvestigations.orgHow Coke Spun the Public on its Water Use+3 more
addresses how to alleviate the burning sensation from eating hot chili peppers but does not connect to Coke or water transforming into chili peppers.quora.comquora.comIf I happen to chew on a hot, red chili pepper by mistake, how do I deal with...
is about a fictional character named Red Hot Chili Pepper and unrelated to food chemistry.jojo.fandom.comjojo.fandom.comRed Hot Chili Pepper
Given the lack of any scientific or culinary evidence in these sources supporting the claim, it appears to be either a misunderstanding, metaphorical statement, or misinformation. No user reports or critical effects related to such a transformation are documented in the sources.
Therefore, based on available evidence, the claim is unverified and likely false.