Rum Substitute( non alcohol )In Frozen Drinks suggestions PLZ?

I bought Bacardi Mixers pina colada non-alcoholic frozen concentrate & Master of Mixes Strawberry Daiquiri/Margarita Mix to make Frozen Drinks But Im a 39 Year Old Mom who does not drink ,My son's Mammie (grandmother) is 57 and she doesn't drink and I want to set a good influence on my 18 year old son who lost his Dad in 1998 at the age of 22 Due to his driving while intoxicated my son was 5 and his step dad in 2007 to an overdose my son was 14 so addictive behaviors with substances I want to be a positive role model for him and i am, .Anyways But we like the fruity drinks with the umbrella's with the cherry's.But i need a substitute

for the rum in the pina colada and a substitute for the rum tequila n the Strawberry Daiquiri .1. non alcohol substitute.2.Not water hats what the can says ,since they are going to be frozen and with the ice already being a water base more water makes it diluted ,watery.3.I as suggested Club soda.I dunno with fruity drinks! so any suggestions would be great .I apologize for the winded story.Thanks Gsmom