How much does civil wedding in Manila cost?

It depends on where you are located as the marriage license's cost varies per municipality, but it won't cost you more than a thousand pesos. For the reception, you may opt for a lunch/dinner with your family and principal sponsors/witnesses in a restaurant or at home. The cost will depend on the number of persons that you will treat for lunch/dinner. If let's say you'll only have around 12 persons, including your husband and you, Php10,000 is more than enough. You can even have a lunch buffet at Yakimix for that amount.

I've read that you will only spend less than a thousand pesos for the marriage rights itself, plus other documents pertinent to it. As for the reception, you may choose to have a small lunch/dinner out with immediate family members and godparents. This should cost more or less 10,000. You may also rent out a venue with your whole family and friends, plus catering services for the food. My estimate would be around 50,000 and up.