P20 Suncream

Good afternoon,
With there only being 47 days until I arrive in the beautiful Içmeler I am looking at suncreams. I usually use Piz Buin Allergy but for some reason never come back home with much of a tan. Plus its a pain putting it on repeatedly through the day (I want to be relaxing and drinking Efes instead of smearing cream all over my body lol). So this year I have decided to give P20 a whirl. It seems to be OK for people with Prickly Heat and you only have to apply it once a day.
So the question is mainly for P20 users. How much will I need for a week in Içmeler? I don't want to end up not having enough so I'm not sure whether I should be getting 100ml or 200ml (hopefully no more than that because it aint all that cheap lol).
So anybody with any advice please.
Thank you kindly
Karl
With there only being 47 days until I arrive in the beautiful Içmeler I am looking at suncreams. I usually use Piz Buin Allergy but for some reason never come back home with much of a tan. Plus its a pain putting it on repeatedly through the day (I want to be relaxing and drinking Efes instead of smearing cream all over my body lol). So this year I have decided to give P20 a whirl. It seems to be OK for people with Prickly Heat and you only have to apply it once a day.
So the question is mainly for P20 users. How much will I need for a week in Içmeler? I don't want to end up not having enough so I'm not sure whether I should be getting 100ml or 200ml (hopefully no more than that because it aint all that cheap lol).
So anybody with any advice please.
Thank you kindly

Karl