Poppi cofounder Allison Ellsworth said she's teaching her children how to value and grow their money.Vivien Killilea/Getty Images for PoppiPoppi's cofounder Allison Ellsworth said she's teaching her children how to invest.She put $5,000 into her three children's Fidelity accounts and let them pick stocks and experience losses.Ellsworth and her husband exited Poppi last year after PepsiCo acquired it for $1.95 billion.Poppi's CEO and cofounder, A…