Connor Heath & Lewis Reilly hit the target in Watford, but an injury time goal robbed Alex Morris' side of all three points.
The Hornets took the lead, but Heath's superb half-volley from the edge of the area levelled things up at half-time.
Lewis Reilly latched on to a long ball to put the Alex ahead in the second period, but the hosts scrambled home late on to record a third draw of the season for Alex Morris' side.
Next up is a home meeting with QPR at the Alexandra Stadium on 10 September, 1pm. Entry is free & the tea bar is in operation.
Crewe: Trialist, Sass-Davies, Fenton, Offord, Johnson, Lynch, Heath, Lundstram, Finney, Reilly, Linton