If you mean a viral claim about a homemade weed killer, “burns weeds in 1 day and they never grow again” is misleading.
Vinegar-based sprays can burn the leaves of many young weeds within hours to a day, especially in warm, sunny weather.
They usually do not kill the roots of established perennial weeds, so the plant can grow back.
Adding salt may make a homemade mixture more damaging to plants, but it can also accumulate in soil and harm desirable plants and soil health.
Boiling water can kill the plant tissue it contacts, but it doesn’t reliably prevent regrowth from deep roots.
There is no simple household drink/mixture that reliably guarantees “never grow again.”
For long-term control, removing the roots when practical, mulching, or using an appropriate registered herbicide according to its label is generally more reliable.
