Burning while passing urine with dark, concentrated urine for a week does point toward a urinary tract infection, though not drinking enough water can also darken urine on its own. A UTI like this usually needs a short course of antibiotics once confirmed, not home remedies alone.
Next Steps
Get a urine routine and culture test done, so the infection and the right antibiotic can be confirmed. Drink at least 2.5 to 3 litres of water daily until then, and avoid holding your urine for long stretches.
Health Tips
See a gynaecologist or physician soon if you also develop fever, back or side pain, since that can mean the infection has spread higher up.