Letters of Intent are a common grant-screening tool. The following template will help you assemble one quickly. The italics indicate instructions and the bold fields. In your draft remove and substitute as discussed.
On your non-profit organization’s letterhead
City, State, Zip
Re: Letter of Intent for Name of Grant
Dear Contact Person:
This letter is inform you that the ABC Non-profit intends to apply for the Name of Grant Program by the month, date, year deadline. The request will range from $250,000 to $350,000 dollars. (The grant program allows up to $400,000 in requests. Giving a range provides you flexibility during drafting. However, if the guidelines require a specific amount, provide this number.) The funds will be used to cite at least one eligible activity and serve approximately # and type of people.
1.List any items requested, i.e., a 501 c3, audit, etc. (If nothing, skip)
Include a basic paragraph to establish your non-profit organization’s credibility. Use your standard statement of introduction, that is, one well-written paragraph of about 50 words long that identifies your mission, an overview of your services and a recent award. You can find additional information about the ABC Non-profit at www.yournonprofit.org 
I look forward to working with you on this application. Please call ###-###-#### or email xx@xxxx  if you need an answer to any questions or additional information.
For more than 20 more articles to help you with grant writing see this directory. 
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For other sources of non-profit income to augment your grant opportunities, read this article , Can Your Organization Obtain More Income?