1. Is that ok if i miss in middle and continue afterwards?
It's Ok and normal.
2. is there any Udyapana process for this pooja. If so after hw many months? and wat is the procedure?
Yes. To get complete results we generally do Udyapana.
It's needed specifically, only if you did Samkashti Vratam at-least four times continuously.
Vratodyapana procedure is almost similar to that of all other Vratams.
It is done in any of these three months: Chaitra, Sravana, Ashviyja.
Do the Samkashti vratam as usual.
Do a big Pooja, offer prayers to Moon god, Samkashti tithi and Ganesha and say “samkaTaam maam nivaaraya”.
Break the fast only after offering Prasad to devotees (Generally 4 or 5 or 12 or 21 in number).
Do Payasa Dana(sweet), Suvarna Dana(gold), Go dana(cow!) etc as per you capacity, all decorated with red cloth.
Do jagarana by chanting Ganesha mantra or reading Ganesha purana etc.
Be careful, Don't drink common water that night. Keep your water aside and don't allow others to drink it.
Do the Laghu Pooja, i.e, small Pooja in the next day morning.
prąy for your desires again and complete the Vratam. That's it.
3. i live in California and here the moon rise is not there till 11 in the night. Can i prąy to moon if i cant c him and break my fast?
It's normal for moon to appear after 11.00 P.M on the day of Smkashti, even in India. Generally moon appears after 48 min the time given in Panchanga. We must wait for the moon to appear.
4.I dont get GARIKA here. is that ok or is Garika important for this pooja?
Try to collect. Ok, sometimes situations may out of our control. Offer at-least by Manasika Pooja.
See these Google results about Garika
5. And we are not having any festivals cos my husbands grand mother ďied last month. Can we do this Vrat or we should stop this also as we dont hav any festivals till 1 year.?
It is like all other Vratams.
On 26th October, Moon rise timing at Mountain-view, California, is: 8:49 P.M and Chaturthi tithi ends by 8:57 P.M. There should be no doubt in this case, of-course moon appears around 9.37 P.M (9.27-9.42).
But, even the moon rise is after the end of Chaturthi tithi, it is generally accepted as Samkashti, if the previous day moon rise falls in Tadiya tithi.
See this excellent article for remaing details: http://www.mypanchang.com/when-to-break ... turthi.php